Blocks:
Ice Age - Alliances, Coldsnap
Mirage - Visions, Weatherlight
Tempest - Stronghold, Exodus
Urza's Saga - Urza's Legacy, Urza's Destiny
Mercadian Masques - Nemesis, Prophecy
Invasion - Planeshift, Apocolypse
Odyssey - Torment, Judgement
Onslaught - Legions, Scourge
Mirrodin - Darksteel, Fifth Dawn
Champions of Kamigawa - Betrayers of Kamigawa, Saviors of Kamigawa
Ravnica: City of Guilds - Guildpact, Dissension
Time Spiral - Planar Chaos, Future Sight
Lorwyn - Morningtide
Shadowmoor - Eventide
Shards of Alara - Conflux
Core sets are Alpha, Beta/Unlimited, Revised, 4th Edition, 5th Edition, 6th Edition, 7th Edition, 8th Edition, 9th Edition, or 10th Edition (X)
Unblocked expansoins are - Arabian Nights, Antiquities, Legends, The Dark, Fallen Empires, and Homelands