Acorn Catapult + Cacophodon + Earthcraft

Acorn Catapult

Cacophodon

Earthcraft

How it works

1. Give Cacophodon indestructible by any method.
2. Activate the basic land by tapping it to add 1.
3. Activate Acorn Catapult by paying 1 and tapping it, dealing 1 damage to Cacophodon and creating a 1/1 Squirrel token.
4. Cacophodon triggers, untapping Acorn Catapult.
5. Activate Earthcraft by tapping the Squirrel token, untapping the basic land.
6. Repeat from step 2.