View source for ML3 Challenge Mode

Are you a master of Shandalar and the constructed gauntlet? Challenge Mode offers a new way to test your skill ahainst difficult AI opponents.  Winning challenges also unlocks new cards.  (Cards will show up in deck builder even if they are locked)
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Here's how to play challenge mode:
Choose the 'Gauntlet' option on the main screen.  Check the 'Challenge Mode' checkbox.
Fire up the gauntlet (1 game per match, and set # of matches to 12) and begin! If you're doing the first challenge (Challenge Set 1 - Tribal Trials), you'll notice that your opponent will start with a Kobold in play.
That means everything is working.
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== General Rules: ==
To win a challenge you must win between 9 and 11 games in a row.  Once you win that many games, a message will appear telling you which card you have unlocked.  Keep playing until you get that message.
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All challenge decks must be either Vintage or Legacy legal.  Some challenges have additional deck building requirements, as described below.  If your challenge auto-loses you at the beginning of the game, it is because your deck is illegal.

'''''Warning:'' If you win a game before the AI has a single turn, challenge mode might get messed up.  Wait until the AI has at least 1 turn before going crazy!'''

== Challenge Descriptions and cards to get unlocked: ==

'''Challenge 1:'''
<br> * [[Tribal Trials]] (Mystic Enforcer) - opponent plays a tribal deck and gets a free creature
<br> *  [[Vanguard Vengeance]] (City of Traitors) - opponent starts the game with a Vanguard Avatar
<br> *  Chipping Away (Mystic Remora) - at the beginning of each game, opponent drains your life
<br> *  [[Onslaught]] (Quirion Dryad) - each upkeep opponent gets a copy of a certain card
<br> *  [[Shandalar 2.0]] (Goblin Welder) - opponent starts the game with specific challenging cards in play
<br> *  BANNED! (Cursed Scroll) - you won't be able to play one or more of your cards, you'll see what is via a legacy card.
<br> *  Planeswalker Decimation (Serum Powder) - Battle the Planeswalkers while losing by 10% of your life/poison/deck each turn.
<br> *  Magic: The Puzzling (Conundrum Sphinx) - Solve several puzzles in a row.  If you fail this challenge, make sure to restart the entire program before trying again.
<br> *  That's Not My Deck (Mirari's Wake) - Build your deck, only to see the computer tinker with it a little.  Only lands from Beta are allowed in your land slot.
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'''Challenge 2:'''
<br> *  Super Mulligan (Rout) - start the game with 2 cards in hand
<br> *  What Hand? (Brain freeze) - skip your draw step
<br> *  That's Big... (Goblin Charbelcher) - you deck can only include lands and cards with mana cost > 3
<br> *  Epic (Manabond) - you can only play 1 spell the entire game
<br> *  There can be only one (Street Wraith) - your deck must be at least 100 cards and have no duplicates
<br> *  March of the Machines (Tangle Wire) - your deck can ONLY include artifacts
<br> *  Land Ho! (Gemstone Mine) - your deck can ONLY include lands,you start the game with Exploration in play.
<br> *  Dude... (Kiki-Jiki, Mirror Breaker) - your deck can ONLY include creatures,you start the game with City of Brass in play.
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'''Challenge 3:'''
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For each of the deck building challenges, you may only use basic and beta dual for lands.
<br> *  Big Dumb Object (Karn, Silver Golem) - Build your deck ONLY with Artifact Creatures. Do not worry, you'll get a FREE Sol Ring.
<br> *  Enchanted Evening (Illusions of Grandeur) - You may only use enchantments
<br> *  Master Warlock (Donate) - You may only use sorceries
<br> *  Urza Wannabe (Tezzeret the Seeker) - You may only use planeswalkers. You can have 6 cards that break this rule.
<br> *  Instant Gratification (Might of Alara) - You may only use instants
<br> *  Gimme! (Sower of Temptation) -AI will copy \ steal one of your permanents.Deck creation is no more restricted to only stealing / copying cards.
<br> *  March of the Machines 2 (Umezawa's Jitte) - You may only use non-creature artifacts
<br> *  Easy as 1, 2, 3... (Bloodbraid Elf) - Your deck must include exactly 4 one casting cost cards, 4 2 CC cards, ... up to 4 10 CC cards.
<br> *  The Perfect Storm (Mind's Desire) - The turn you play a spell, you must win the game
<br> *  [[Sliver Nation]] (Sliver Overlord). - Fight an increasingly difficult horde of Slivers
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'''Challenge 4:'''
<br> *  Chaos Orb (Violent Ultimatum) - Randomly have a permanent of yours tapped, bounced, or destroyed each turn.
<br> *  [[Pit Fighting]] (???) - Dive into the pit and battle a seasoned pit fighter.  Watch out for the scorpions!
<br> *  Life's a Lich (Phyrexian Negator) - Win the challenge without dying to your own Lich
<br> *  Cascade (Bituminous Blast) - Every spell opponent plays has cascade
<br> *  ABC's (Leyline of the Void) - Every card in your deck must start with the same letter.
<br> *  Challenge Challenge (Helm of Obedience) - You can only use card you have unlocked via challenge mode.  You may also use basics and beta duals for lands.
<br> *  Enchanted (???) - Battle your way through an enchantment-enhanced group of opponents.
<br> *  Budget deck for ya (Leatherback Baloth): beat the challenge with a mono-colored deck (no hybrids allowed) built only with commons and uncommons (this restriction does not apply to lands, but you're still restricted to Beta-only lands).
<br> *  Archenemy's Cohort (???): beat the 8 powerful, legendary allies of the Archenemy and then the Archenemy itself ! Your deck must be at least 100 cards and have no duplicates, except for basic lands.
<br> *  Back to '95 (???): Win this gauntlet using a deck made of cards released before 1996 (Alpha-Beta-Unlimited / Arabian Nights / Antiquities / Legends / The Dark / Homelands) and get some help in Challenge Mode.

The '???' rewards are non-card unlocks.  You'll have to discover what they are on your own, but they only impact Challenge Mode, making it easier to win other challenges.