Simulacrum Synthesizer is a mythic Artifact card from The Big Score Promos (PBIG), collector number 6p. Current market price: $26.94 (foil $27.81), TCGplayer market prices via Scryfall.
When this artifact enters, scry 2. Whenever another artifact you control with mana value 3 or greater enters, create a 0/0 colorless Construct artifact creature token with "This token gets +1/+1 for each artifact you control."