Most played cards in Affinity:

38 Decks
Ancient Tomb
152 copies - 4 average
Walking Ballista
140 copies - 3.68 average
Arcbound Ravager
138 copies - 3.63 average
Mox Opal
134 copies - 3.53 average
Thorn of Amethyst
127 copies - 3.34 average
Chalice of the Void
124 copies - 3.26 average
Stonecoil Serpent
124 copies - 3.26 average
Steel Overseer
88 copies - 2.32 average
City of Traitors
86 copies - 2.26 average
Wasteland
83 copies - 2.18 average
Lotus Petal
75 copies - 1.97 average
Phyrexian Revoker
73 copies - 1.92 average
Seat of the Synod
72 copies - 1.89 average
Mishra's Factory
67 copies - 1.76 average
Urza's Saga
60 copies - 1.58 average
Thought Monitor
60 copies - 1.58 average
Nettlecyst
57 copies - 1.5 average
Vault Skirge
56 copies - 1.47 average
Ancient Den
55 copies - 1.45 average
Darksteel Citadel
53 copies - 1.39 average