Most played cards in Sneak Attack:

2 Decks
Force of Will
8 copies - 4 average
Show and Tell
8 copies - 4 average
Ponder
8 copies - 4 average
Brainstorm
8 copies - 4 average
Preordain
6 copies - 3 average
Emrakul, the Aeons Torn
5 copies - 2.5 average
Omniscience
4 copies - 2 average
Cunning Wish
4 copies - 2 average
Lotus Petal
4 copies - 2 average
Orim's Chant
4 copies - 2 average
Prismatic Vista
4 copies - 2 average
Sneak Attack
4 copies - 2 average
Scalding Tarn
4 copies - 2 average
City of Traitors
4 copies - 2 average
Dress Down
4 copies - 2 average
Polluted Delta
4 copies - 2 average
Fury
3 copies - 1.5 average
Surgical Extraction
3 copies - 1.5 average
Impulse
3 copies - 1.5 average
Volcanic Island
3 copies - 1.5 average