Tenured Tethermage is a rare Creature — Human Artificer card from Reality Fracture (FRA), collector number 357. Current market price: $0.33 (foil $0.55), TCGplayer market prices via Scryfall.
When this creature enters, you may sacrifice a land. If you do, create two tapped Heartwood tokens. (They're red and green artifacts with "{T}: Add {R} or {G}.") Tap two untapped artifacts you control: Put two +1/+1 counters on this creature.