City on Fire 135 (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 - $21.50
LP - $17.20
MP - $12.90
HP - $8.60
DMG - $4.30