Tenured Tethermage

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.

"Today, you will be learning material repurposing and adaptation. This will be on the test."