Most played cards in Sneak Red:

3 Decks
Simian Spirit Guide
12 copies - 4 average
Ancient Tomb
12 copies - 4 average
Sneak Attack
12 copies - 4 average
City of Traitors
12 copies - 4 average
Trinisphere
12 copies - 4 average
Lotus Petal
12 copies - 4 average
Griselbrand
11 copies - 3.67 average
Emrakul, the Aeons Torn
11 copies - 3.67 average
Through the Breach
10 copies - 3.33 average
Seething Song
10 copies - 3.33 average
Scalding Tarn
8 copies - 2.67 average
Show and Tell
8 copies - 2.67 average
Worldspine Wurm
7 copies - 2.33 average
Chalice of the Void
7 copies - 2.33 average
Elvish Spirit Guide
6 copies - 2 average
Chandra, Awakened Inferno
5 copies - 1.67 average
Volcanic Island
4 copies - 1.33 average
Leyline of the Void
4 copies - 1.33 average
Karn, the Great Creator
4 copies - 1.33 average
Abrade
4 copies - 1.33 average