Most played cards in Stiflenought:

2 Decks
Polluted Delta
8 copies - 4 average
Phyrexian Dreadnought
8 copies - 4 average
Brainstorm
8 copies - 4 average
Stifle
8 copies - 4 average
Vision Charm
8 copies - 4 average
Force of Will
8 copies - 4 average
Underground Sea
6 copies - 3 average
Mana Drain
5 copies - 2.5 average
Flooded Strand
5 copies - 2.5 average
Meddling Mage
4 copies - 2 average
Tundra
4 copies - 2 average
Glowrider
4 copies - 2 average
Duress
4 copies - 2 average
Ancestral Knowledge
4 copies - 2 average
Daze
3 copies - 1.5 average
Phyrexian Furnace
3 copies - 1.5 average
Swords to Plowshares
3 copies - 1.5 average
Annul
3 copies - 1.5 average
Mother of Runes
3 copies - 1.5 average
Volcanic Island
2 copies - 1 average