Patron of the Moon + Cloudstone Curio + Horizon Explorer

Patron of the Moon

Cloudstone Curio

Horizon Explorer

How it works

1. Activate Patron of the Moon by paying 1, putting two nonartifact lands from your hand onto the battlefield untapped due to Horizon Explorer.
2. When the lands enter, Cloudstone Curio triggers twice.
3. Holding priority, activate the lands by tapping them, adding at least 1.
4. Resolve both Cloudstone Curio triggers, returning the lands from the battlefield to your hand.
5. Repeat.

This brilliant loop centers on Patron of the Moon's ability to dump lands directly onto the battlefield, where Horizon Explorer ensures they arrive fresh and untapped to immediately pay for the activation. As those lands enter, Cloudstone Curio triggers to bounce them right back to your hand, allowing you to float your mana and reset the entire process. Meanwhile, Horizon Explorer's passive ability keeps your lands entering untapped so you always have the necessary energy to sustain the loop indefinitely.