Most played cards in Prison:

5 Decks
 ↓ Howling Mine
17 copies – 3.4 avg
↓ Winter Orb
17 copies – 3.4 avg
↓ Relic Barrier
16 copies – 3.2 avg
↓ Icy Manipulator
13 copies – 2.6 avg
↓ Mishra's Factory
12 copies – 2.4 avg
↓ Black Vise
9 copies – 1.8 avg
↓ Triskelion
9 copies – 1.8 avg
↓ Desert
8 copies – 1.6 avg
↓ Mishra's Workshop
8 copies – 1.6 avg
↓ Urza's Mine
8 copies – 1.6 avg
↓ Taiga
8 copies – 1.6 avg
↓ Ivory Tower
8 copies – 1.6 avg
↓ Urza's Tower
8 copies – 1.6 avg
↓ Bayou
8 copies – 1.6 avg
↓ Badlands
8 copies – 1.6 avg
↓ Urza's Power Plant
8 copies – 1.6 avg
↓ Fellwar Stone
7 copies – 1.4 avg
↓ Tetravus
7 copies – 1.4 avg
↓ Lightning Bolt
6 copies – 1.2 avg
↓ Ice Storm
6 copies – 1.2 avg