Most played cards in MUD:

605 Decks
Ancient Tomb
2407 copies – 3.98 avg
Grim Monolith
2218 copies – 3.67 avg
City of Traitors
2218 copies – 3.67 avg
Chalice of the Void
2200 copies – 3.64 avg
Lodestone Golem
2076 copies – 3.43 avg
Metalworker
1994 copies – 3.3 avg
Trinisphere
1709 copies – 2.82 avg
Wasteland
1708 copies – 2.82 avg
Kuldotha Forgemaster
1642 copies – 2.71 avg
Wurmcoil Engine
1592 copies – 2.63 avg
Cloudpost
1084 copies – 1.79 avg
Glimmerpost
1065 copies – 1.76 avg
Phyrexian Revoker
977 copies – 1.61 avg
Cavern of Souls
943 copies – 1.56 avg
Lightning Greaves
787 copies – 1.3 avg
Vesuva
775 copies – 1.28 avg
Ratchet Bomb
768 copies – 1.27 avg
Tormod's Crypt
705 copies – 1.17 avg
Sundering Titan
675 copies – 1.12 avg
Steel Hellkite
619 copies – 1.02 avg