Rings of Brighthearth + Seeker of Skybreak + Alena, Kessig Trapper

Rings of Brighthearth

Seeker of Skybreak

Alena, Kessig Trapper

How it works

1. Activate Alena by tapping it, adding at least .
2. Activate Seeker of Skybreak by tapping it, targeting itself.
3. Rings of Brighthearth triggers, causing you to pay 2 to copy Seeker of Skybreak's ability, targeting Alena.
4. Resolve both Seeker of Skybreak abilities, untapping it and Alena.
5. Repeat.

This ingenious loop transforms Alena, Kessig Trapper into an absolute powerhouse of red mana, provided her power has been sufficiently boosted for her to yield more than the two mana required for the copy. By tapping Seeker of Skybreak to untap itself, you trigger Rings of Brighthearth, which lets you pay two mana to duplicate the untap effect and target Alena instead. As both untap abilities resolve, you are left with your entire loop reset and a net gain of mana each iteration.