Siege Wurm is a common Creature — Wurm card from Ravnica: City of Guilds (RAV), collector number 183. Current market price: $0.05 (foil $0.34), 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.) Trample