War Balloon is a uncommon Artifact — Vehicle card from Avatar: The Last Airbender (TLA), collector number 159. Current market price: $0.11 (foil $0.22), TCGplayer market prices via Scryfall.
Flying {1}: Put a fire counter on this Vehicle. As long as this Vehicle has three or more fire counters on it, it's an artifact creature. Crew 3 (Tap any number of creatures you control with total power 3 or more: This Vehicle becomes an artifact creature until end of turn.)