Boiling Rock Rioter (Avatar: The Last Airbender)

Creature Ñ Human Rogue Ally - 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.