Okay, since I basically beat the challenge, though I didn't get credit yet, I'll put up the final version of the deck I used to do it:
;Keeper Challenge Version
;
;#oldgames
;
;29/08/2009
;1
;4th Edition
;
.1 1
Ancestral Recall.249 1
Time Walk.248 1
Time Vault.250 1
Timetwister.1351 1
Tinker.1886 1
Burning Wish.317 1
Tolarian Academy.1550 1
Voltaic Key.165 1
Mox Emerald.166 1
Mox Jet.167 1
Mox Pearl.168 1
Mox Ruby.528 1
Strip Mine.230 1
Sol Ring.17 1
Black Lotus.10 1
Balance.62 1
Demonic Tutor.451 4
Ring of Ma'rûf.202 1
Regrowth.1501 1
Zuran Orb.1971 1
Mind Over Matter.169 1
Mox Sapphire.333 1
Vampiric Tutor.331 1
Imperial Seal.349 4
Enlightened Tutor.1893 4
Forbidden Orchard.1899 4
Living Wish.47 4
Copy Artifact.1889 1
Cunning Wish.254 3
Tundra.258 3
Underground Sea.252 3
Tropical Island.1306 4
Sculpting Steel.352 1
Mystical Tutor.457 1
Mox Diamond.1424 1
Lotus PetalThe deck has no win condition as such; it has to wish for one. The entire deck is based around wishing and getting the
Time Vault /
Voltaic Key combo, after which you can do whatever you want. Usually I wish for a
Disintegrate (if I have lots of mana) or
Broodstar (if not) as the kill.
Round 1) Get the Vault/Key out, wish for a
Moat or something, and sit until the AI drops 10 lands. You may need to help him out by wishing for
Path to Exile. After he drops the 10th land, throw a
Disintegrate to the head and sac excess lands to
Zuran Orb, which is maindecked.
Round 2) Vault/Key, then wish for Pandora's Box/
Leviathan and any 1/1 (
Goblin Welder is useful) or, against some decks, sit on a
Moat and wait until enough lords are out to pump his zombie/goblin/merfolk/soldier/whatever to 10/10. Wish for a kill.
Round 3) Vault/Key, then
Timetwister, wish for a
Glimpse the Unthinkable and a win condition.
Round 4) Vault/Key, then wish for
Magister Sphinx and
Hatred, satisfying the life requirements and giving the win condition at the same time.
Round 5) Vault/Key, then
Timetwister,
Ancestral Recall the AI, and dump your cards in any convenient manner; cast them or dump to
Mind Over Matter.
Round 6) Vault/Key, then wish for stuff to speed things along.
Traumatize,
Prosperity, and so on.
Round 7) Vault/Key. *Be careful to wish only once until you exile 10 AI cards* The card of choice is
Jester's Cap, making sure for one activation to only pick one card, not 3. (
Path to Exile and
Tormod's Crypt also work, but
Jester's Cap is easiest)
Round

Vault/Key. Forbidden Orchards make AI creatures if he didn't get up to 10. Wish for any creature; a
Broodstar is good since it can also go in for the kill.
Round 9) Vault/Key. Wish for
Master Transmuter,
Spellbook,
Braingeyser,
Moat, and
Gravity Sphere, and play them all. Make sure you have 10 blue mana and 10 cards in hand, or else one card in hand for every blue mana you don't have. Use
Mind Over Matter to untap the transmuter and blue mana as needed to bounce/return your
Time Vault repeatedly and skip 10 turns. Then wish for a win condition or use the braingeyser if you get it back.
Round 10) Vault/Key. Wish for
Goblin Welder,
Ashnod's Transmogrant, and
Arcbound Ravager. Use
Forbidden Orchard, make 10 spirits, turn them all into artifact creatures, then have the Ravager eat everything except himself. Kill with Ravager or wish for something.
Round 11) Vault/Key. Wish for 10 Strip Mines, Power Struggle,
Dryad Arbor, Pandora's Box,
Moat,
Cyclopean Tomb,
Reiterate,
Meddling Mage. Use
Reiterate on each Wish. Turn all the Strip Mines into Swamps with the Tomb. Play
Moat so you don't die to Dryad Arbors, and name
Tranquility with
Meddling Mage so the AI doesn't blow away your enchantments. Use the Box to pump out Dryad Arbors, and sac any you get with
Zuran Orb. Sac all nonstripmine lands and one strip mine to maximize chances of giving away a swamp(strip mine), and sac the
Dryad Arbor you get back. Once the AI *finally* has 10 swamps,
Tinker your
Cyclopean Tomb to destroy it, wait 10 turns (all your lands should have been sacced before) and play your
Strip Mine, and wish for a win condition.