There are 54 of these in total, and they're each numbered for anyone who wants to collect them all. So you've got something to work with, here's a list of the 54 cards that got the Art Series treatment:
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Chillerpillar
Watcher for Tomorrow
Scour All Possibilities
Bazaar Trademage
Serra the Benevolent
Wrenn and Six
Endling
Warteye Witch
Throes of Chaos
Ayula, Queen Among Bears
Ranger-Captain of Eos
Zhalfirin Decoy
Urza, Lord High Artificer
Yawgmoth, Thran Physician
Umezawa's Charm
Sisay, Weatherlight Captain
Goblin Matron
Pashalik Mons
Smoke Shroud
Throatseeker
Ingenious Infiltrator
Ninja of the New Moon
Morophon, the Boundless
Lancer Sliver
Enduring Sliver
First Sliver's Chosen
Dregscape Sliver
Soulherder
Force of Despair
Answered Prayers
Winds of Abandon
Everdream
Mind Rake
Echo of Eons
Face of Divinity
Ephemerate
Ravenous Giant
Spinehorn Minotaur
Lesser Masticore
Mirrodin Besieged
Lightning Skelemental
Hogaak, Arisen Necropolis
Excavating Anurid
Headless Specter
Plague Engineer
Sword of Truth and Justice
Sword of Sinew and Steel
Prismatic Vista
Wall of One Thousand Cuts
Rebuild
Silent Clearing
Waterlogged Grove
Arcum's Astrolabe
Mox Tantalite