Most played cards in Stiflenought:

2 Decks
Stifle
8 copies - 4 average
Force of Will
8 copies - 4 average
Brainstorm
8 copies - 4 average
Phyrexian Dreadnought
6 copies - 3 average
Polluted Delta
6 copies - 3 average
Flooded Strand
5 copies - 2.5 average
Wasteland
4 copies - 2 average
Dark Confidant
4 copies - 2 average
Volcanic Island
4 copies - 2 average
Punishing Fire
4 copies - 2 average
Delver of Secrets
4 copies - 2 average
Grove of the Burnwillows
4 copies - 2 average
Spell Pierce
3 copies - 1.5 average
Misdirection
3 copies - 1.5 average
Ponder
3 copies - 1.5 average
Daze
3 copies - 1.5 average
Thoughtseize
3 copies - 1.5 average
Relic of Progenitus
3 copies - 1.5 average
Spell Snare
3 copies - 1.5 average
Engineered Explosives
3 copies - 1.5 average