Ioreth of the Healing House, Leyline of Singularity, and Clever Conjurer

Prerequisites

• Ioreth of the Healing House on the battlefield
• Leyline of Singularity on the battlefield
• Clever Conjurer on the battlefield

Steps

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

Results

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