Most played cards in All Spells:

61 Decks
Balustrade Spy
244 copies - 4 average
Dark Ritual
244 copies - 4 average
Undercity Informer
243 copies - 3.98 average
Chrome Mox
243 copies - 3.98 average
Lotus Petal
242 copies - 3.97 average
Simian Spirit Guide
242 copies - 3.97 average
Narcomoeba
241 copies - 3.95 average
Elvish Spirit Guide
240 copies - 3.93 average
Cabal Ritual
238 copies - 3.9 average
Gitaxian Probe
206 copies - 3.38 average
Pact of Negation
205 copies - 3.36 average
Summoner's Pact
198 copies - 3.25 average
Street Wraith
195 copies - 3.2 average
Manamorphose
192 copies - 3.15 average
Goblin Charbelcher
147 copies - 2.41 average
Cabal Therapy
136 copies - 2.23 average
Lion's Eye Diamond
131 copies - 2.15 average
Spoils of the Vault
89 copies - 1.46 average
Dread Return
67 copies - 1.1 average
Leyline of Sanctity
63 copies - 1.03 average