Most played cards in Mono Red Eldrazi Control:

1 Decks
Kozilek's Return
4 copies - 4 average
Ulamog, the Ceaseless Hunger
4 copies - 4 average
Battlefield Forge
4 copies - 4 average
Spatial Contortion
4 copies - 4 average
Thought-Knot Seer
4 copies - 4 average
Hedron Archive
4 copies - 4 average
Warping Wail
4 copies - 4 average
Oblivion Sower
4 copies - 4 average
Matter Reshaper
4 copies - 4 average
Sanctum of Ugin
4 copies - 4 average
Mage-Ring Network
4 copies - 4 average
Shivan Reef
4 copies - 4 average
Shrine of the Forsaken Gods
4 copies - 4 average
Hedron Crawler
4 copies - 4 average
Spawning Bed
4 copies - 4 average
Reality Smasher
4 copies - 4 average
Ruin Processor
2 copies - 2 average
Titan's Presence
2 copies - 2 average
Emrakul, the Promised End
1 copies - 1 average
Nahiri's Wrath
1 copies - 1 average