Most played cards in MUD:

605 Decks
Ancient Tomb
2363 copies – 3.91 avg
Grim Monolith
2195 copies – 3.63 avg
City of Traitors
2178 copies – 3.6 avg
Chalice of the Void
2123 copies – 3.51 avg
Lodestone Golem
2063 copies – 3.41 avg
Metalworker
1981 copies – 3.27 avg
Kuldotha Forgemaster
1635 copies – 2.7 avg
Wurmcoil Engine
1580 copies – 2.61 avg
Wasteland
1363 copies – 2.25 avg
Trinisphere
1355 copies – 2.24 avg
Cloudpost
1052 copies – 1.74 avg
Glimmerpost
1005 copies – 1.66 avg
Phyrexian Revoker
905 copies – 1.5 avg
Cavern of Souls
895 copies – 1.48 avg
Lightning Greaves
772 copies – 1.28 avg
Vesuva
718 copies – 1.19 avg
Ratchet Bomb
707 copies – 1.17 avg
Sundering Titan
663 copies – 1.1 avg
Tormod's Crypt
648 copies – 1.07 avg
Steel Hellkite
609 copies – 1.01 avg