Afterburner Expert is a rare Creature — Goblin Artificer card from Aetherdrift Promos (PDFT), collector number 150s. Current market price: — (foil $0.53), TCGplayer market prices via Scryfall.
Exhaust — {2}{G}{G}: Put two +1/+1 counters on this creature. (Activate each exhaust ability only once.) Whenever you activate an exhaust ability, return this card from your graveyard to the battlefield.