Most played cards in Draw-Go:

2 Decks
Isochron Scepter
8 copies - 4 average
Memory Lapse
8 copies - 4 average
Vedalken Shackles
8 copies - 4 average
Counterspell
8 copies - 4 average
Fire // Ice
7 copies - 3.5 average
Mox Diamond
6 copies - 3 average
Chill
6 copies - 3 average
Miscalculation
6 copies - 3 average
Gilded Drake
6 copies - 3 average
Thirst for Knowledge
6 copies - 3 average
Dust Bowl
6 copies - 3 average
Fact or Fiction
5 copies - 2.5 average
Mana Leak
4 copies - 2 average
Accumulated Knowledge
4 copies - 2 average
Misdirection
3 copies - 1.5 average
Annul
3 copies - 1.5 average
Chrome Mox
3 copies - 1.5 average
Cunning Wish
3 copies - 1.5 average
Shivan Reef
3 copies - 1.5 average
Powder Keg
3 copies - 1.5 average