Moritte of the Frost, Ioreth of the Healing House, and Clever Conjurer

Prerequisites

• Moritte of the Frost on the battlefield
• Ioreth of the Healing House on the battlefield
• Clever Conjurer on the battlefield
• Moritte of the Frost and Ioreth of the Healing House do not have summoning sickness
• You control at least one additional legendary creature

Steps

1. Activate Ioreth's second ability by tapping it, untapping Moritte and any other legendary creature you control
2. Activate Moritte by tapping it, untapping Ioreth
3. Repeat

Results

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