Most played cards in TPS:

1 Decks
Brainstorm
4 copies - 4 average
Duress
4 copies - 4 average
Polluted Delta
4 copies - 4 average
Dark Ritual
4 copies - 4 average
Force of Will
4 copies - 4 average
Hydroblast
3 copies - 3 average
Misdirection
3 copies - 3 average
Underground Sea
3 copies - 3 average
Tendrils of Agony
2 copies - 2 average
Cabal Therapy
2 copies - 2 average
Hurkyl's Recall
2 copies - 2 average
Tinker
1 copies - 1 average
Tolarian Academy
1 copies - 1 average
Timetwister
1 copies - 1 average
Time Walk
1 copies - 1 average
Rushing River
1 copies - 1 average
Rebuild
1 copies - 1 average
Primitive Justice
1 copies - 1 average
Vampiric Tutor
1 copies - 1 average
Yawgmoth's Will
1 copies - 1 average