Most played cards in Mystic Forge Combo:

4 Decks
 ↓ Karn, the Great Creator
16 copies – 4 avg
↓ The One Ring
16 copies – 4 avg
↓ Manifold Key
16 copies – 4 avg
↓ Grim Monolith
16 copies – 4 avg
↓ Lotus Petal
16 copies – 4 avg
↓ Ancient Tomb
16 copies – 4 avg
↓ Urza's Saga
15 copies – 3.75 avg
↓ Urza's Workshop
12 copies – 3 avg
↓ Urza's Tower
12 copies – 3 avg
↓ Planar Nexus
12 copies – 3 avg
↓ Painter's Servant
8 copies – 2 avg
↓ Kozilek's Command
8 copies – 2 avg
↓ Tezzeret, Cruel Captain
8 copies – 2 avg
↓ Defense Grid
8 copies – 2 avg
↓ Mystic Forge
7 copies – 1.75 avg
↓ Voltaic Key
7 copies – 1.75 avg
↓ Paradox Engine
7 copies – 1.75 avg
↓ Mox Opal
7 copies – 1.75 avg
↓ Basalt Monolith
7 copies – 1.75 avg
↓ Faerie Macabre
6 copies – 1.5 avg