Most played cards in MUD:

475 Decks
Mishra's Workshop
1899 copies - 4 average
Wasteland
1856 copies - 3.91 average
Sphere of Resistance
1855 copies - 3.91 average
Ancient Tomb
1840 copies - 3.87 average
Phyrexian Revoker
1557 copies - 3.28 average
Stonecoil Serpent
1252 copies - 2.64 average
Walking Ballista
1243 copies - 2.62 average
Grafdigger's Cage
1173 copies - 2.47 average
Arcbound Ravager
1168 copies - 2.46 average
Foundry Inspector
1120 copies - 2.36 average
Mishra's Factory
940 copies - 1.98 average
Null Rod
874 copies - 1.84 average
Leyline of the Void
703 copies - 1.48 average
Wurmcoil Engine
617 copies - 1.3 average
Golos, Tireless Pilgrim
558 copies - 1.17 average
Crucible of Worlds
512 copies - 1.08 average
Sorcerous Spyglass
505 copies - 1.06 average
Black Lotus
474 copies - 1 average
Mox Jet
474 copies - 1 average
Mox Pearl
474 copies - 1 average