Bumi, King of Three Trials is a uncommon Legendary Creature — Human Noble Ally card from Avatar: The Last Airbender (TLA), collector number 169. Current market price: $0.16 (foil $0.32), TCGplayer market prices via Scryfall.
When Bumi enters, choose up to X, where X is the number of Lesson cards in your graveyard — • Put three +1/+1 counters on Bumi. • Target player scries 3. • Earthbend 3. (Target land you control becomes a 0/0 creature with haste that's still a land. Put three +1/+1 counters on it. When it dies or is exiled, return it to the battlefield tapped.)