Rings of Brighthearth + Seeker of Skybreak + Sanctum Weaver

Rings of Brighthearth

Seeker of Skybreak

Sanctum Weaver

How it works

1. Activate Sanctum Weaver by tapping it, adding at least three mana of any color.
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 Sanctum Weaver.
4. Resolve both Seeker of Skybreak abilities, untapping it and Sanctum Weaver.
5. Repeat.

This ingenious loop relies on a clever synergy between Seeker of Skybreak and Sanctum Weaver, turning a simple untap effect into an engine for infinite mana. When you tap Sanctum Weaver for its enchantment-fueled mana, Seeker of Skybreak is ready to untap it, but the true catalyst is Rings of Brighthearth; by paying {2} to copy the Seeker's ability, you get to untap *both* creatures at once. This leaves you with enough net mana to continuously fund the Rings of Brighthearth copy fee while infinitely repeating the process. It's a wonderful demonstration of how a static cost-copier can turn a modest tap ability into an unstoppable machine.