Bumi, Unleashed is a mythic Legendary Creature — Human Noble Ally card from Avatar: The Last Airbender (TLA), collector number 348. Current market price: $8.35 (foil $8.37), TCGplayer market prices via Scryfall.
Trample When Bumi enters, earthbend 4. Whenever Bumi deals combat damage to a player, untap all lands you control. After this phase, there is an additional combat phase. Only land creatures can attack during that combat phase.