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

Prerequisites

• Rings of Brighthearth on the battlefield
• Seeker of Skybreak on the battlefield
• Alena, Kessig Trapper on the battlefield
• Seeker of Skybreak and Alena do not have summoning sickness
• You had a creature with power 3 or greater enter the battlefield under your control this turn

Steps

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 to copy Seeker of Skybreak's ability, targeting Alena
4. Resolve both Seeker of Skybreak abilities, untapping it and Alena
5. Repeat

Results

• Infinite mana creatures you control can produce
• Infinite untap of creatures you control