Kenrith, the Returned King + Carrion Feeder + Peregrine Drake

Kenrith, the Returned King

Carrion Feeder

Peregrine Drake

How it works

1. Activate up to five lands by tapping them, adding at least 4.
2. Activate Kenrith's fifth ability by paying 4, returning Peregrine Drake from your graveyard to the battlefield.
3. When Peregrine Drake enters the battlefield, it triggers, untapping up to five lands.
4. Activate Carrion Feeder by sacrificing Peregrine Drake, putting a +1/+1 counter on Carrion Feeder.
5. Repeat.

This elegant loop relies on Kenrith, the Returned King's black-mana activated ability to continuously dredge Peregrine Drake back from the graveyard, utilizing the Drake's enters-the-battlefield trigger to untap your lands and instantly refund the mana spent. Meanwhile, Carrion Feeder serves as the crucial sacrifice outlet that sends the Drake back to the graveyard to repeat the cycle, steadily growing larger with +1/+1 counters along the way.