Most played cards in Mono-Red Eldrazi:

2 Decks
Reality Smasher
8 copies - 4 average
Hanweir Garrison
8 copies - 4 average
Hangarback Walker
8 copies - 4 average
Battlefield Forge
7 copies - 3.5 average
Chandra, Flamecaller
7 copies - 3.5 average
Shivan Reef
7 copies - 3.5 average
Thought-Knot Seer
7 copies - 3.5 average
Incendiary Flow
6 copies - 3 average
Roast
6 copies - 3 average
Kozilek's Return
5 copies - 2.5 average
Foundry of the Consuls
5 copies - 2.5 average
Eldrazi Obligator
5 copies - 2.5 average
Rending Volley
4 copies - 2 average
Matter Reshaper
4 copies - 2 average
Goldnight Castigator
4 copies - 2 average
Spatial Contortion
4 copies - 2 average
Vile Aggregate
4 copies - 2 average
Collective Defiance
4 copies - 2 average
Fiery Impulse
4 copies - 2 average
Westvale Abbey
4 copies - 2 average