City on Fire 135/291 (March of the Machine)

Convoke (Your creatures can help cast this spell. Each creature you tap while casting this spell pays for {1} or one mana of that creature's color.) If a source you control would deal damage to a permanent or player, it deals triple that damage instead.

NM - $23.80
LP - $19.10
MP - $14.30
HP - $9.60
DMG - $4.80