Ioreth of the Healing House, and Fatestitcher

Prerequisites

• Ioreth of the Healing House on the battlefield
• Fatestitcher on the battlefield
• Ioreth and Fatestitcher do not have summoning sickness
• There is another legendary creature on the battlefield

Steps

1. If Fatestitcher is not your Ring-bearer, use the card that causes the Ring to tempt you to cause Fatestitcher to become your Ring-bearer, thus making it legendary
2. Activate Ioreth's second ability by tapping it, untapping Fatestitcher and another legendary creature
3. Activate Fatestitcher by tapping it, untapping Ioreth
4. Repeat from step 2

Results

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