City on Fire is a rare Enchantment card from March of the Machine Promos (PMOM), collector number 135p. Current market price: $11.78 (foil $11.33), TCGplayer market prices via Scryfall.
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.