Most played cards in UrzaTron:

1 Decks
Urza's Power Plant
4 copies - 4 average
Urza's Mine
4 copies - 4 average
Thirst for Knowledge
4 copies - 4 average
Condescend
4 copies - 4 average
Expedition Map
4 copies - 4 average
Urza's Factory
4 copies - 4 average
Spatial Contortion
2 copies - 2 average
Remand
2 copies - 2 average
Mindslaver
2 copies - 2 average
Warping Wail
2 copies - 2 average
Spreading Seas
2 copies - 2 average
Dismember
2 copies - 2 average
Hurkyl's Recall
2 copies - 2 average
Wurmcoil Engine
2 copies - 2 average
Repeal
2 copies - 2 average
Ghost Quarter
2 copies - 2 average
River of Tears
1 copies - 1 average
Grafdigger's Cage
1 copies - 1 average
Crucible of Worlds
1 copies - 1 average
Walking Ballista
1 copies - 1 average