Fire Sages is a uncommon Creature — Human Cleric card from Avatar: The Last Airbender (TLA), collector number 136. Current market price: $0.16 (foil $0.27), TCGplayer market prices via Scryfall.
Firebending 1 (Whenever this creature attacks, add {R}. This mana lasts until end of combat.) {1}{R}{R}: Put a +1/+1 counter on this creature.