Most played cards in Red Prision:

1 Decks
Ancient Tomb
4 copies - 4 average
Blood Moon
4 copies - 4 average
City of Traitors
4 copies - 4 average
Den of the Bugbear
4 copies - 4 average
Dead // Gone
4 copies - 4 average
Trinisphere
4 copies - 4 average
Leyline of the Void
4 copies - 4 average
Chrome Mox
4 copies - 4 average
Legion Warboss
4 copies - 4 average
Fury
4 copies - 4 average
Simian Spirit Guide
4 copies - 4 average
Goblin Rabblemaster
4 copies - 4 average
Shatterskull Smashing
4 copies - 4 average
Chalice of the Void
4 copies - 4 average
Bonecrusher Giant
3 copies - 3 average
Fiery Confluence
3 copies - 3 average
Chandra, Torch of Defiance
3 copies - 3 average
Magus of the Moon
3 copies - 3 average
Fireflux Squad
2 copies - 2 average