Most played cards in Boros Prison:

1 Decks
Pillage
4 copies - 4 average
Ghostly Prison
4 copies - 4 average
Suppression Field
4 copies - 4 average
Molten Rain
4 copies - 4 average
Stone Rain
4 copies - 4 average
Mana Tithe
4 copies - 4 average
Boom // Bust
4 copies - 4 average
Lightning Bolt
4 copies - 4 average
Rest in Peace
3 copies - 3 average
Oust
3 copies - 3 average
Trinisphere
2 copies - 2 average
Defense Grid
2 copies - 2 average
Magus of the Tabernacle
2 copies - 2 average
Goblin Dark-Dwellers
2 copies - 2 average
Boil
2 copies - 2 average
Valakut Awakening
2 copies - 2 average
Wrath of God
1 copies - 1 average
Gemstone Caverns
1 copies - 1 average