City on Fire [March of the Machine Prerelease Promos]

Set: March of the Machine Prerelease Promos Type: Enchantment Rarity: Rare Cost: {5}{R}{R}{R} 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.