Most played cards in All Spells:

4 Decks
Balustrade Spy
16 copies – 4 avg
Agadeem's Awakening
16 copies – 4 avg
Lotus Petal
16 copies – 4 avg
Chrome Mox
16 copies – 4 avg
Dark Ritual
16 copies – 4 avg
Cabal Ritual
16 copies – 4 avg
Turntimber Symbiosis
16 copies – 4 avg
Elvish Spirit Guide
16 copies – 4 avg
Simian Spirit Guide
16 copies – 4 avg
Narcomoeba
16 copies – 4 avg
Undercity Informer
16 copies – 4 avg
Summoner's Pact
15 copies – 3.75 avg
Pact of Negation
14 copies – 3.5 avg
Chancellor of the Annex
13 copies – 3.25 avg
Nature's Claim
11 copies – 2.75 avg
Force of Vigor
10 copies – 2.5 avg
Cabal Therapy
9 copies – 2.25 avg
Thoughtseize
8 copies – 2 avg
Xantid Swarm
6 copies – 1.5 avg
Dread Return
5 copies – 1.25 avg