GryphonsClaw:
Red and Blue are way too overpowered with those sets' commons:
4 Mountain Goat
4 Roterothopter
4 Dwarven Soldier
4 Phrexian Warbeast
4 Storm Shaman
3 Anaba Shaman
4 Incinerate
4 Guerilla tactics
4 Lava Burst
1 Meteor Shower
2 Serrated Arrows
22 Mountians
4 Counterspell
4 Powersink
2 Arcane Denial
2 Mersine
4 Word of Undoing
4 Phrexian Warbeast
2 Benthic Explorers
3 Illusionary Forces
4 Ray of Command
4 Brainstorm
4 Zuran Spellcaster
23 Island
Black doesn't get much removal other than Soul Burn and Dark Banishing, and while Green gets some efficient creatures, White gets screwed. I'd much rather limit the decks to all commons from all expansions, avoiding Fallen Empires because it only brings in Hymn to Tourach, which is a definite cheat( Ritual-Hymn-Duress, next turn put out Fallen Askari, etc) this also makes card access a little easier. Good start, though.
Erik