Most played cards in Stiflenought:

2 Decks
Phyrexian Dreadnought
8 copies - 4 average
Stifle
8 copies - 4 average
Brainstorm
8 copies - 4 average
Force of Will
8 copies - 4 average
Wasteland
8 copies - 4 average
Delver of Secrets
8 copies - 4 average
Daze
7 copies - 3.5 average
Flooded Strand
6 copies - 3 average
Ponder
6 copies - 3 average
Polluted Delta
5 copies - 2.5 average
Spell Pierce
5 copies - 2.5 average
Lightning Bolt
4 copies - 2 average
Dark Confidant
4 copies - 2 average
Surgical Extraction
4 copies - 2 average
Snapcaster Mage
4 copies - 2 average
Flusterstorm
3 copies - 1.5 average
Thoughtseize
3 copies - 1.5 average
Scalding Tarn
3 copies - 1.5 average
Chill
2 copies - 1 average
Blood Moon
2 copies - 1 average