Garbage Elemental is a uncommon Creature — Elemental Rigger card from Unstable (UST), collector number 82b. Current market price: $0.71 (foil $10.90), TCGplayer market prices via Scryfall.
When this creature enters, it assembles a Contraption. (Put the top card of your Contraption deck face up onto one of your sprockets.) Undying (When this creature dies, if it had no +1/+1 counters on it, return it to the battlefield under its owner's control with a +1/+1 counter on it.)