Requires

Springheart Nantuko must be on the battlefield (attached to Dryad Arbor). Dryad Arbor must be on the battlefield. Earthcraft must be on the battlefield. Doubling Season must be on the battlefield. You have at least one land card in hand. You are able to play a land this turn. You control at least one basic Forest, or the land card in your hand is a basic Forest. Mana needed:

Steps

1. Play any land from your hand, ensuring to play a basic Forest if you have one in hand.
2. When the land enters the battlefield, Springheart Nantuko triggers, causing you to pay to create two token copies of Dryad Arbor.
3. When the Dryad Arbor tokens enter the battlefield, Springheart Nantuko triggers twice.
4. Holding priority, activate a basic Forest by tapping it, adding .
5. Activate Earthcraft by tapping a Dryad Arbor token, untapping the basic Forest.
6. Repeat steps 4 and 5 one additional time.
7. Resolve the first Springheart Nantuko trigger, choosing not to pay and creating two 1/1 Insect creature tokens.
8. Resolve the second Springheart Nantuko trigger, causing you to pay to create two token copies of Dryad Arbor.
9. Repeat from step 3.

Results