Most played cards in God-Eternal Kefnet:

2 Decks
Opt
2 copies - 1 average
Negate
2 copies - 1 average
Part the Waterveil
2 copies - 1 average
Pull from Tomorrow
2 copies - 1 average
Remand
2 copies - 1 average
Mystic Confluence
2 copies - 1 average
Personal Tutor
2 copies - 1 average
Mental Misstep
2 copies - 1 average
Ancient Tomb
2 copies - 1 average
Karn's Temporal Sundering
2 copies - 1 average
Mana Leak
2 copies - 1 average
Mana Short
2 copies - 1 average
Repeal
2 copies - 1 average
Memory Lapse
2 copies - 1 average
Miscalculation
2 copies - 1 average
Spell Snare
2 copies - 1 average
Walk the Aeons
2 copies - 1 average
Unsubstantiate
2 copies - 1 average
Jace, the Mind Sculptor
2 copies - 1 average
Sapphire Medallion
2 copies - 1 average