Gimbal, Gremlin Prodigy is a mythic Legendary Creature — Gremlin Artificer card from March of the Machine Commander (MOC), collector number 3. Current market price: $0.29 (foil $0.35), TCGplayer market prices via Scryfall.
Artifact creatures you control have trample. At the beginning of your end step, create a 0/0 red Gremlin artifact creature token. Put X +1/+1 counters on it, where X is the number of differently named artifact tokens you control.