Fang, Roku's Companion is a rare Legendary Creature — Dragon card from Avatar: The Last Airbender Eternal (TLE), collector number 115. Current market price: $0.20 (foil $2.12), TCGplayer market prices via Scryfall.
Flying Whenever Fang attacks, another target legendary creature you control gets +X/+0 until end of turn, where X is Fang's power. When Fang dies, if he wasn't a Spirit, return this card to the battlefield under your control. He's a Spirit in addition to his other types.