Synth Infiltrator is a rare Artifact Creature — Synth card from Fallout (PIP), collector number 330. Current market price: $2.50 (foil $0.94), TCGplayer market prices via Scryfall.
Improvise (Your artifacts can help cast this spell. Each artifact you tap after you're done activating mana abilities pays for {1}.) You may have this creature enter as a copy of any creature on the battlefield, except it's a Synth artifact creature in addition to its other types.