Precursor Golem is a rare Artifact Creature — Golem card from Modern Masters 2015 (MM2), collector number 225. Current market price: $0.29 (foil $0.55), TCGplayer market prices via Scryfall.
When this creature enters, create two 3/3 colorless Golem artifact creature tokens. Whenever a player casts an instant or sorcery spell that targets only a single Golem, that player copies that spell for each other Golem that spell could target. Each copy targets a different one of those Golems.