Most played cards in Eldrazi:

4 Decks
Cavern of Souls
16 copies - 4 average
Thought-Knot Seer
16 copies - 4 average
Eldrazi Temple
16 copies - 4 average
Ancient Tomb
16 copies - 4 average
Wasteland
15 copies - 3.75 average
Glaring Fleshraker
12 copies - 3 average
Sowing Mycospawn
12 copies - 3 average
Kozilek's Command
12 copies - 3 average
Chalice of the Void
12 copies - 3 average
Devourer of Destiny
11 copies - 2.75 average
Dismember
9 copies - 2.25 average
Eye of Ugin
9 copies - 2.25 average
Wastescape Battlemage
8 copies - 2 average
Leyline of the Void
8 copies - 2 average
Mox Diamond
7 copies - 1.75 average
It That Heralds the End
6 copies - 1.5 average
Disruptor Flute
5 copies - 1.25 average
Yavimaya, Cradle of Growth
4 copies - 1 average
Thalia, Guardian of Thraben
4 copies - 1 average
Reality Smasher
4 copies - 1 average