Patron of the Moon + Wonderscape Sage + Retreat to Coralhelm + Amulet of Vigor

Patron of the Moon

Wonderscape Sage

Retreat to Coralhelm

Amulet of Vigor

How it works

1. Activate the mana-producing land by tapping it, adding at least 1.
2. Activate Wonderscape Sage by tapping it and returning the mana-producing land from the battlefield to your hand, causing you to draw a card and discard a card if the land didn't have a nonbasic land type.
3. Activate Patron of the Moon by paying 1, putting the mana-producing land from your hand onto the battlefield.
4. When the land enters the battlefield, Amulet of Vigor and Retreat to Coralhelm trigger.
5. Resolve the Retreat to Coralhelm trigger, untapping Wonderscape Sage.
6. Resolve the Amulet of Vigor trigger, untapping the land.
7. Repeat.