Ioreth of the Healing House, Aura of Dominion, and Alena, Kessig Trapper

Prerequisites

• Ioreth of the Healing House on the battlefield
• Aura of Dominion on the battlefield
• Alena, Kessig Trapper on the battlefield

Steps

1. Activate Alena by tapping it, adding at least Activate Ioreth's second ability by tapping it, untapping Alena and another legendary creature
2. Activate Aura of Dominion by paying and tapping the other legendary creature, untapping Ioreth
3. Repeat

Results

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