Most played cards in Battle of Wits:

3 Decks
Fact or Fiction
12 copies - 4 average
Fire // Ice
12 copies - 4 average
Engineered Plague
12 copies - 4 average
Talisman of Progress
12 copies - 4 average
Duress
12 copies - 4 average
Talisman of Dominance
12 copies - 4 average
Flametongue Kavu
12 copies - 4 average
Smother
12 copies - 4 average
Opt
12 copies - 4 average
Polluted Delta
12 copies - 4 average
Mana Leak
12 copies - 4 average
Shivan Reef
12 copies - 4 average
Gifts Ungiven
12 copies - 4 average
Insidious Dreams
12 copies - 4 average
Diabolic Tutor
12 copies - 4 average
Talisman of Indulgence
12 copies - 4 average
Darkwater Catacombs
12 copies - 4 average
Bloodstained Mire
12 copies - 4 average
Battle of Wits
12 copies - 4 average
Chrome Mox
12 copies - 4 average