Boiling Rock Rioter is a rare Creature — Human Rogue Ally card from Avatar: The Last Airbender (TLA), collector number 87. Current market price: $0.18 (foil $0.31), TCGplayer market prices via Scryfall.
Firebending 1 (Whenever this creature attacks, add {R}. This mana lasts until end of combat.) Tap an untapped Ally you control: Exile target card from a graveyard. Whenever this creature attacks, you may cast an Ally spell from among cards you own exiled with this creature.