Most played cards in Robots:

2 Decks
Copy Artifact
8 copies - 4 average
Fellwar Stone
8 copies - 4 average
Triskelion
8 copies - 4 average
Tundra
8 copies - 4 average
Su-Chi
8 copies - 4 average
Sage of Lat-Nam
8 copies - 4 average
Juggernaut
8 copies - 4 average
Blue Elemental Blast
6 copies - 3 average
Icy Manipulator
6 copies - 3 average
Blood Moon
6 copies - 3 average
Disenchant
6 copies - 3 average
Swords to Plowshares
6 copies - 3 average
Red Elemental Blast
6 copies - 3 average
City of Brass
6 copies - 3 average
Mana Vault
4 copies - 2 average
Armageddon
4 copies - 2 average
Atog
4 copies - 2 average
Badlands
4 copies - 2 average
Plateau
4 copies - 2 average
Underground Sea
4 copies - 2 average