Bosco, Just a Bear is a uncommon Legendary Creature — Bear card from Avatar: The Last Airbender Eternal (TLE), collector number 132. Current market price: $0.50 (foil $4.64), TCGplayer market prices via Scryfall.
When Bosco enters, create a Food token for each legendary creature you control. (It's an artifact with "{2}, {T}, Sacrifice this token: You gain 3 life.") {2}{G}, Sacrifice a Food: Put two +1/+1 counters on Bosco. He gains trample until end of turn.