Most played cards in U/R Splice:

3 Decks
Shivan Reef
12 copies - 4 average
Pyroclasm
10 copies - 3.33 average
Ire of Kaminari
8 copies - 2.67 average
Reach Through Mists
8 copies - 2.67 average
Peer Through Depths
8 copies - 2.67 average
Glacial Ray
8 copies - 2.67 average
Remand
7 copies - 2.33 average
Consuming Vortex
7 copies - 2.33 average
Eerie Procession
6 copies - 2 average
Muddle the Mixture
6 copies - 2 average
Sleight of Hand
4 copies - 1.33 average
Shock
4 copies - 1.33 average
Seething Song
4 copies - 1.33 average
Eye of Nowhere
4 copies - 1.33 average
4 copies - 1.33 average
Steam Vents
4 copies - 1.33 average
Lava Spike
4 copies - 1.33 average
Desperate Ritual
4 copies - 1.33 average
Ideas Unbound
4 copies - 1.33 average
Electrolyze
4 copies - 1.33 average