Earthcraft + Wolfwillow Haven + Ant Queen

Earthcraft

Wolfwillow Haven

Ant Queen

How it works

1. Activate Ant Queen by paying 1, creating a creature token
2. Activate Earthcraft by tapping the creature token, untapping a basic Forest.
3. Activate the Forest by tapping it, adding
4. Wolfwillow Haven triggers, adding
5. Repeat

This loop relies on Wolfwillow Haven enchanted to a basic Forest to supercharge your mana production, turning a single tap into two green mana instead of one. With that bonus mana fueling Ant Queen, you can continuously pay to churn out 1/1 Insect tokens. Earthcraft then ties the whole engine together by letting you immediately tap those newly minted tokens to untap your enchanted Forest, keeping the mana flowing and letting you repeat the process to generate an endless swarm of creatures.