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List of the unlockable cards in D15. * indicates a "Premium" card.
There are many other cards used within the campaign, explore and tutorial modes not available as unlockable cards - See the AI-only list below.

Elite Vanguard
Kitesail Apprentice *
Selfless Cathar
Trained Caracal
Loyal Pegasus
Cloudshift *
Righteous Blow
Swift Justice
Gods Willing
Stoneforge Mystic *
Hero of Iroas
Ajani's Pridemate
Wall of Omens *
Ordeal of Heliod
Reprisal
Glory Seeker
Squadron Hawk *
Lone Missionary
Leonin Snarecaster
Nimbus Wings
Raise the Alarm
Brimaz, King of Oreskos
Mentor of the Meek
Banisher Priest
Attended Knight
Standing Troops
Arrest *
Safe Passage
Solemn Offering
Rhox Faithmender
Seance
Mausoleum Guard
Paragon of New Dawns *
Phantom General
Armored Ascension
Angelic Accord
Kor Cartographer
Assault Griffin
Marked by Honor
Inspired Charge
Divine Verdict
Baneslayer Angel
Thraben Purebloods
Meditation Puzzle
Angelic Edict
Aegis Angel
Palisade Giant
Planar Cleansing
Triplicate Spirits
Resolute Angel
Seraph of the Masses
Quicken
Hedron Crab
Kraken Hatchling
Cloudfin Raptor
Triton Shorestalker
Vapor Snag *
Fleeting Distraction
Tome Scour
Void Snare
Artful Dodge
Quickling
Military Intelligence
Maritime Guard
Doorkeeper
Ior Ruin Expedition
Negate
Nullify
Chasm Skulker
Voyage's End
Think Twice *
Niblis of the Breath
Dissolve
Chill of Foreboding
Frost Lynx
Wind Drake
Blind Phantasm
Coral Barrier *
Pestermite *
Scroll Thief
Hysterical Blindness
Talrand, Sky Summoner *
Jalira, Master Polymorphist
Bident of Thassa
Phantasmal Dragon *
Paragon of Gathering Mists *
Breaching Hippocamp
Archaeomancer
Moon Heron
Inspiration
Time Warp
Mercurial Pretender
Switcheroo
Surrakar Banisher
Soul of Ravnica
Roil Elemental
Mahamoti Djinn
Horizon Scholar
Thassa's Bounty
Kraken of the Straits
Cruel Sadist
Tormented Hero
Quest for the Gravelord
Ulcerate
Suffer the Past
Asphodel Wanderer
Death Cultist
Pharika's Chosen *
Dead Weight
Deviant Glee
Demonic Appetite
Undying Evil
Bloodghast
Child of Night
Walking Corpse
Drudge Skeletons
Vicious Hunger *
Agent of the Fates
Tribute to Hunger
Giant Scorpion
Necromancer's Assistant
Liliana's Specter *
Bloodflow Connoisseur
Corpse Blockade
Phyrexian Rager *
Devouring Swarm
Assassinate
Mind Rot
Dead Reckoning *
Graveborn Muse *
Paragon of Open Graves *
Cutthroat Maneuver
Accursed Spirit
Gravedigger
Ogre Jailbreaker
Rotted Hulk
Shadowborn Demon
Indulgent Tormentor
Sanguine Bond
Monomania
Rescue from the Underworld
Rotfeaster Maggot
Shadowcloak Vampire
Flesh to Dust
Nightmare
Blood Tribute
Maalfeld Twins
Rune-Scarred Demon
Covenant of Blood
Griselbrand
Skeletal Wurm
Quest for the Goblin Lord
Coordinated Assault
Goblin Arsonist
Foundry Street Denizen
Goblin Bushwhacker *
Satyr Hoplite
Furor of the Bitten
Shock
Burning Inquiry *
Volcanic Geyser
Skullcrack *
Goblin Shortcutter *
Bloodcrazed Neonate
Kiln Fiend
Inferno Fist
Fling
Krenko's Command
Goblin Rabblemaster
Anger of the Gods
Guttersnipe
Rakish Heir
Rockslide Elemental
Cunning Sparkmage
Regathan Firecat
Two-Headed Cerberus
Lightning Talons
Raid Bombardment
Seismic Strike *
Trumpet Blast
Act of Treason
Bolt of Keranos
Ogre Battledriver
Brood Keeper
Paragon of Fierce Defiance *
Tectonic Rift
Marauding Maulhorn
Vent Sentinel
Russet Wolves
Portent of Betrayal
Demolish
Stormbreath Dragon
Wrecking Ogre
Burning Anger
Pitchburn Devils
Inferno Titan
Charmbreaker Devils
Shivan Dragon
Warstorm Surge *
Blood Feud
Explosive Impact
Siege Dragon
Primal Bellow
Elvish Pioneer
Spire Tracer
Young Wolf *
Gathering Courage *
Fog
Prey Upon
Genesis Hydra
Jade Mage
Elvish Visionary
Timberland Guide
Satyr Wayfinder
Wandering Wolf
Naturalize
Titanic Growth
Elder of Laurels
Scion of hte Wild
Beastmaster Ascension
Reclamation Sage
Triump of Ferocity
Grazing Gladehart
Battering Krasis
Advocate of the Beast
Aura Gnarlid *
Grave Bramble
Cultivate
Vengevine
Paragon of Eternal Wilds *
Saruli Gatekeepers
Nylea's Disciple
Primal Huntbeast
Mold Shambler *
Chorus of Might
Living Destiny
Hunt the Weak
Arbor Colossus
Doubling Season *
Hunter's Prowess
Garruk's Packleader *
Spider Spawning
Enlarge
Mischief and Mayhem
Nessian Asp
Stomper Cub
Soul of Zendikar
Terra Stomper
Phytotitan
Nemesis of Mortals
Howlgeist
Pelakka Wurm
Siege Wurm
Azorius Guildgate
Izzet Guildgate
Rakdos Guildgate
Selesnya Guildgate
Boros Guildgate
Dimir Guildgate
Gruul Guildgate
Simic Guildgate
Golgari Guildgate
Orzhov Guildgate
Radiant Fountain
Pyxis of Pandemonium
Hot Soup
Darksteel Axe *
Elixir of Immortality
Adventuring Gear
Traveler's Amulet
Illusionist's Bracers
Millstone *
Warmonger's Chariot
Cobbled Wings
Hall of Triumph *
Gargoyle Sentinel
Greatsword
Blasting Station *
Darksteel Ingot *
Avarice Amulet
Galvanic Juggernaut *
Creepy Doll
Meteorite
Sphinx-Bone Wand
Kozilek, Butcher of Truth *
Maelstrom Archangel *
Skymark Roc
Vizkopa Guildmage
Truefire Paladin
Selesnya Evangel
Dinrova Horror
Goblin Electromancer
Species Gorger
Auger Spree
Treasured Find
Ground Assault

AI-only cards (Alphabetical)

Acolyte of Xathrid
Adaptive Snapjaw
Æther Adept
Æther Figment
Aggressive Mining
Air Elemental
Ajani's Chosen
Ajani's Mantra
Ajani's Sunstriker
Akroan Crusader
Akroan Horse
Akroan Skyguard
Alchemist's Apprentice
Amass the Components
Anax and Cymede
Ancient Hellkite
Angel's Mercy
Annihilating Fire
Arachnus Spinner
Arachnus Web
Archangel
Archivist
Armament Master
Armored Warhorse
Asphyxiate
Assault Zeppelid
Assemble the Legion
Avenger of Zendikar
Avenging Arrow
Azure Mage
Banishing Stroke
Barony Vampire
Basilica Guards
Basilica Screecher
Battle Mastery
Battle Sliver
Battlewise Valor
Bayou
Beast Within
Belligerent Sliver
Benthic Giant
Bioshift
Bitterheart Witch
Bladetusk Boar
Blaze
Blazing Torch
Blinding Mage
Blood Crypt
Blood Ogre
Blood Seeker
Bloodgift Demon
Bloodrite Invoker
Bloodrock Cyclops
Bloodthrone Vampire
Blur Sliver
Bogbrew Witch
Bold Defense
Bomber Corps
Bond Beetle
Bonebreaker Giant
Bonescythe Sliver
Bonesplitter
Borderland Minotaur
Boros Charm
Boros Elite
Boros Mastiff
Boundless Realms
Bountiful Harvest
Brindle Boar
Bubbling Cauldron
Burst Lightning
Butcher Ghoul
Call of the Conclave
Cancel
Canopy Spider
Captain of the Watch
Caravan Hurda
Carnival Hellsteed
Carrion Crow
Cathedral Sanctifier
Centaur's Herald
Chandra's Phoenix
Chapel Geist
Charcoal Diamond
Chorus of the Tides
Chosen by Heliod
Chronicler of Heroes
Chronozoa
Cinder Elemental
Civic Wayfinder
Claustrophobia
Cliff Threader
Cloaked Siren
Coiling Oracle
Colossal Whale
Cone of Flame
Constricting Sliver
Consume Strength
Corpse Hauler
Corrupt
Cosi's Ravager
Counterlash
Counterspell
Courser of Kruphix
Coursers' Accord
Crazed Goblin
Crippling Blight
Crippling Chill
Curiosity
Curse of Bloodletting
Curse of Death's Hold
Curse of Echoes
Curse of Stalked Prey
Curse of the Bloody Tome
Curse of the Nightly Hunt
Curse of the Pierced Heart
Curse of Thirst
Cyclops of One-Eyed Pass
Daring Skyjek
Dark Hatchling
Deadly Recluse
Deathbellow Raider
Debt to the Deathless
Deepwater Hypnotist
Defy Death
Demon of Death's Gate
Demonic Tutor
Demon's Jester
Diabolic Tutor
Disentomb
Divination
Divine Favor
Downpour
Dragon Egg
Dragon Hatchling
Dragonskull Summit
Dragonspeaker Shaman
Drakewing Krasis
Drown in Filth
Drowned Catacomb
Dryad Militant
Duskdale Wurm
Duskhunter Bat
Dutiful Thrull
Elite Skirmisher
Elvish Champion
Emancipation Angel
Emeria, the Sky Ruin
Endless Obedience
Entangling Vines
Entreat the Angels
Essence Scatter
Ethereal Armor
Evernight Shade
Evolving Wilds
Experiment One
Eyes in the Skies
Falkenrath Noble
Fanatic of Mogis
Fatal Fumes
Fathom Mage
Favored Hoplite
Feast on the Fallen
Felhide Brawler
Felhide Minotaur
Felidar Sovereign
Feral Hydra
Feral Incarnation
Festering Newt
Fire Diamond
Firebreathing
Firewing Phoenix
Flame Slash
Flametongue Kavu
Flamewave Invoker
Fleshmad Steed
Forbidden Alchemy
Forsaken Drifters
Fortress Crab
Frilled Oculus
Furnace Whelp
Galerider Sliver
Gallows Warden
Garruk's Companion
Gatecreeper Vine
Gatekeeper of Malakir
Geist of the Moors
Geist-Honored Monk
Ghostly Possession
Ghoulraiser
Giant Growth
Giant Spider
Gift of Immortality
Gloomhunter
Gloomwidow
Glorious Charge
Gluttonous Cyclops
Godhunter Octopus
Godless Shrine
Goliath Sphinx
Goliath Spider
Gorehorn Minotaurs
Gore-House Chainwalker
Gossamer Phantasm
Grappler Spider
Grappling Hook
Gravepurge
Gravetiller Wurm
Gray Merchant of Asphodel
Graypelt Hunter
Griffin Guide
Grim Discovery
Grim Roustabout
Griptide
Grisly Salvage
Grisly Spectacle
Groundshaker Sliver
Groundswell
Guard Gomazoa
Gutter Skulk
Halo Hunter
Harmonize
Harrow
Havoc Festival
Healer of the Pride
Heliod's Pilgrim
Hellfire Mongrel
Heroes' Bane
Highland Berserker
Highway Robber
Hive Stirrings
Hold the Gates
Hollowhenge Beast
Holy Justiciar
Honor of the Pure
Hover Barrier
Illusionary Servant
Imperious Perfect
In Garruk's Wake
Infantry Veteran
Inferno Trap
Innocent Blood
Jace's Mindseeker
Jaddi Lifestrider
Jet Medallion
Join the Ranks
Joraga Bard
Joraga Warcaller
Kalastria Highborn
Kalonian Tusker
Kessig Recluse
Khalni Garden
Khalni Heart Expedition
Kingpin's Pet
Kitesail
Knight of Obligation
Kor Hookmaster
Kor Line-Slinger
Kor Outfitter
Kor Sanctifiers
Kragma Warcaller
Krovikan Mist
Laboratory Maniac
Lagonna-Band Elder
Launch the Fleet
Lavaball Trap
Lavaborn Muse
Lay of the Land
Lethargy Trap
Lightkeeper of Emeria
Lightning Strike
Liliana's Caress
Liliana's Reaver
Liliana's Shade
Living Totem
Lorthos, the Tidemaker
Magma Rift
Manor Skeleton
Man-o'-War
Marble Diamond
March of the Returned
Marsh Casualties
Marsh Threader
Mass of Ghouls
Maze's End
Megantic Sliver
Messenger's Speed
Midnight Haunting
Miming Slime
Mind Sculpt
Minotaur Abomination
Minotaur Skullcleaver
Moss Diamond
Mulch
Murasa Pyromancer
Murder
Mutilate
Narrow Escape
Nature's Lore
Nav Squad Commandos
Necrobite
Nessian Courser
Nettle Swine
Niblis of the Mist
Nightguard Patrol
Nimbus Swimmer
Nissa's Chosen
Nissa's Expedition
Obstinate Baloth
Ondu Cleric
Onyx Mage
Opal Lake Gatekeepers
Oracle of Mul Daya
Oran-Rief Survivalist
Ordruun Veteran
Oreskos Sun Guide
Oreskos Swiftclaw
Ostracize
Oust
Overrun
Overwhelm
Pacifism
Palace Guard
Pensive Minotaur
Peregrination
Phantasmal Bear
Phantom Beast
Pheres-Band Centaurs
Pheres-Band Raiders
Pheres-Band Thunderhoof
Pheres-Band Tromper
Pheres-Band Warchief
Pilgrim's Eye
Polluted Dead
Polymorph
Polymorphist's Jest
Predatory Sliver
Pride Guardian
Primal Cocoon
Primordial Hydra
Prodigal Pyromancer
Protean Hydra
Punishing Fire
Purge the Profane
Putrefy
Putrid Leech
Pyromancer's Gauntlet
Rageblood Shaman
Rakdos Pit Dragon
Rakdos Ringleader
Rakdos Shred-Freak
Rampaging Baloths
Rampant Growth
Ray of Command
Reanimate
Reaper from the Abyss
Rebuke
Reckless Brute
Recumbent Bliss
Renegade Demon
Repel the Darkness
Rest for the Weary
Returned Centaur
Returned Reveler
Rise from the Grave (tutorial only)
Risen Sanctuary
Rix Maadi Guildmage
Roiling Terrain
Rot Farm Skeleton
Rotting Fensnake
Rumbling Baloth
Runeclaw Bear
Runeflare Trap
Rush of Blood
Ruthless Cullblade
Sacred Foundry
Sage's Row Denizen
Savage Surge
Savannah Lions
Scathe Zombies
Scourge of Skola Vale
Scourgemark
Sea God's Revenge
Seal of Fire
Searing Spear
Seismic Shudder
Selhoff Occultist
Seller of Songbirds
Sentinel Sliver
Sentinel Spider
Seraph Sanctuary
Serpent of the Endless Sea
Sewer Shambler
Shambleshark
Shipwreck Singer
Shriekgeist
Sightless Ghoul
Sign in Blood
Silence the Believers
Silent Artisan
Simic Sky Swallower
Siren of the Fanged Coast
Sky Diamond
Skyknight Legionnaire
Slaughter Cry
Slaughterhorn
Sleep
Slime Molding
Slitherhead
Smelt-Ward Gatekeepers
Snapping Creeper
Snuff Out
Somberwald Spider
Soul Stair Expedition
Soulcage Fiend
Spectral Prison
Spiked Baloth
Spiritmonger
Spreading Seas
Staff of the Death Magus
Staff of the Flame Magus
Staff of the Mind Magus
Staff of the Sun Magus
Steelform Sliver
Stone Idol Trap
Stonework Puma
Stormblood Berserker
Stormfront Pegasus
Striking Sliver
Stromkirk Patrol
Sudden Storm
Sunspire Gatekeepers
Sunspring Expedition
Supplyline Cranes
Survival Cache
Swordwise Centaur
Sylvan Ranger
Syndic of Tithes
Tajuru Archer
Temple of Deceit
Temple of Malice
Temple of Plenty
Tenacious Dead
Terramorphic Expanse
Terrifying Presence
Terrus Wurm
Thought Scour
Thraben Valiant
Thragtusk
Thrill-Kill Assassin
Timberpack Wolf
Tithe Drinker
Tomb Hex
Torch Fiend
Tormented Soul
Transguild Promenade
Traumatize
Triumph of Cruelty
Tropical Island
Trostani's Judgment
Trostani's Summoner
Trusty Machete
Tuktuk Grunts
Turn to Frog
Ubul Sar Gatekeepers
Underworld Cerberus
Unhallowed Pact
Unstable Footing
Unsummon
Urban Evolution
Valakut, the Molten Pinnacle
Vampire Interloper
Vampire Nighthawk
Vampiric Feast
Vendetta
Venom Sliver
Veteran Armorsmith
Veteran Swordsmith
Veteran's Reflexes
Vigor Mortis
Vinelasher Kudzu
Vizkopa Confessor
Volcanic Dragon
Vulpine Goliath
Wake the Reflections
Wakedancer
Wall of Blossoms
Wall of Vines
Wall of Wood
Warpath Ghoul
War-Wing Siren
Water Servant
Way of the Thief
Wayfaring Temple
Whiplash Trap
Wild Celebrants
Windborne Charge
Witch's Familiar
Woodland Cemetery
Wring Flesh
Xathrid Slyblade
Young Pyromancer
Zanikev Locust
Zealous Strike
Zof Shade
Zombie Goliath

You are missing several cards from the AI, like Snuff Out or Simic Sky Swallower. Either way, Sumomole uploaded all the cards available into a compressed file here:

viewtopic.php?p=156118#p156118

Well the AI list was a WIP, made by hand through observation and note-taking. Now that the files are available and I'm home from work, I'll have a complete list uploaded shortly.