Ioreth of the Healing House, and North Pole Patrol

Prerequisites

• Ioreth of the Healing House on the battlefield
• North Pole Patrol on the battlefield

Steps

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