Most played cards in EldraTron:

2 Decks
Expedition Map
4 copies - 2 average
Chalice of the Void
4 copies - 2 average
Matter Reshaper
4 copies - 2 average
Thought-Knot Seer
4 copies - 2 average
Walking Ballista
4 copies - 2 average
Urza's Tower
4 copies - 2 average
Reality Smasher
4 copies - 2 average
Urza's Mine
4 copies - 2 average
Eldrazi Temple
4 copies - 2 average
Urza's Power Plant
4 copies - 2 average
Warping Wail
3 copies - 1.5 average
Ratchet Bomb
3 copies - 1.5 average
Ghost Quarter
3 copies - 1.5 average
Wastes
2 copies - 1 average
Hangarback Walker
2 copies - 1 average
Relic of Progenitus
2 copies - 1 average
Ugin, the Spirit Dragon
2 copies - 1 average
Cavern of Souls
2 copies - 1 average
Dismember
2 copies - 1 average
Endbringer
2 copies - 1 average