Niblis of the Breath, Rings of Brighthearth, and Heronblade Elite

Prerequisites

• Niblis of the Breath on the battlefield
• Rings of Brighthearth on the battlefield
• Heronblade Elite on the battlefield
• Heronblade Elite and Niblis do not have summoning sickness
• Heronblade Elite has a power of four or greater

Steps

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

Results

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