Tezzeret the Schemer is a mythic Legendary Planeswalker — Tezzeret card from Aether Revolt Promos (PAER), collector number 137s. Current market price: — (foil $4.49), TCGplayer market prices via Scryfall.
+1: Create a colorless artifact token named Etherium Cell with "{T}, Sacrifice this token: Add one mana of any color." −2: Target creature gets +X/-X until end of turn, where X is the number of artifacts you control. −7: You get an emblem with "At the beginning of combat on your turn, target artifact you control becomes an artifact creature with base power and toughness 5/5."