Master of Etherium is a rare Artifact Creature — Vedalken Wizard card from Shards of Alara (ALA), collector number 49. Current market price: $0.71 (foil $2.09), TCGplayer market prices via Scryfall.
Master of Etherium's power and toughness are each equal to the number of artifacts you control. Other artifact creatures you control get +1/+1.