Ioreth of the Healing House, and Kelpie Guide

Prerequisites

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

Steps

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