Most played cards in Nekusar, the Mindrazer:

2 Decks
Treasure Cruise
2 copies - 1 average
Wheel of Fortune
2 copies - 1 average
Ponder
2 copies - 1 average
Serum Visions
2 copies - 1 average
Ancestral Vision
2 copies - 1 average
Bloodstained Mire
2 copies - 1 average
Simian Spirit Guide
2 copies - 1 average
Demonic Tutor
2 copies - 1 average
Windfall
2 copies - 1 average
Dark Petition
2 copies - 1 average
Dig Through Time
2 copies - 1 average
Seething Song
2 copies - 1 average
Turnabout
2 copies - 1 average
Brainstorm
2 copies - 1 average
Cabal Ritual
2 copies - 1 average
Dark Ritual
2 copies - 1 average
Desperate Ritual
2 copies - 1 average
Preordain
2 copies - 1 average
Yawgmoth's Will
2 copies - 1 average
Beseech the Queen
2 copies - 1 average