Peregrine Drake + Elesh Norn, Mother of Machines + Cavern Harpy

Peregrine Drake

Elesh Norn, Mother of Machines

Cavern Harpy

How it works

1. Activate up to five lands by tapping them, adding at least 2.
2. Cast Peregrine Drake by paying its mana cost.
3. When Peregrine Drake enters, it triggers twice. Resolve the first trigger, untapping five lands.
4. Holding priority, activate up to five lands by tapping them, adding at least 2.
5. Resolve the second Peregrine Drake trigger, untapping five lands.
6. Cast Cavern Harpy by paying its mana cost.
7. When Cavern Harpy enters, it triggers twice, returning it and Peregrine Drake from the battlefield to your hand.
8. Repeat.