Scrapper Champion is a uncommon Creature — Human Artificer card from Aether Revolt (AER), collector number 97. Current market price: $0.25 (foil $0.48), TCGplayer market prices via Scryfall.
Double strike (This creature deals both first-strike and regular combat damage.) When this creature enters, you get {E}{E} (two energy counters). Whenever this creature attacks, you may pay {E}{E}. If you do, put a +1/+1 counter on it.