Experimental Synthesizer is a common Artifact card from Kamigawa: Neon Dynasty (NEO), collector number 138. Current market price: $0.43 (foil $0.95), TCGplayer market prices via Scryfall.
When this artifact enters or leaves the battlefield, exile the top card of your library. Until end of turn, you may play that card. {2}{R}, Sacrifice this artifact: Create a 2/2 white Samurai creature token with vigilance. Activate only as a sorcery.