Heartfire Immolator is a uncommon Creature — Human Wizard card from Core Set 2021 (M21), collector number 150. Current market price: $0.12 (foil $0.29), TCGplayer market prices via Scryfall.
Prowess (Whenever you cast a noncreature spell, this creature gets +1/+1 until end of turn.) {R}, Sacrifice this creature: It deals damage equal to its power to target creature or planeswalker.