Inner-Flame Acolyte is a common Creature — Elemental Shaman card from Duel Decks: Jace vs. Chandra (DD2), collector number 41. Current market price: $0.10, TCGplayer market prices via Scryfall.
When this creature enters, target creature gets +2/+0 and gains haste until end of turn. Evoke {R} (You may cast this spell for its evoke cost. If you do, it's sacrificed when it enters.)