Scrapyard Mongrel is a common Creature — Dog card from Magic 2015 (M15), collector number 160. Current market price: $0.06 (foil $0.50), TCGplayer market prices via Scryfall.
As long as you control an artifact, this creature gets +2/+0 and has trample. (It can deal excess combat damage to the player or planeswalker it's attacking.)