Ioreth of the Healing House, The Eleventh Hour, Vizier of Tumbling Sands, and Akroma's Memorial

Prerequisites

• Ioreth of the Healing House on the battlefield
• The Eleventh Hour on the battlefield
• Vizier of Tumbling Sands on the battlefield
• Akroma's Memorial on the battlefield
• Vizier of Tumbling Sands and Ioreth of the Healing House do not have summoning sickness
• There is at least one other legendary creature on the battlefield
• The Eleventh Hour has exactly two lore counters on it

Steps

1. At the beginning of your precombat main phase, The Eleventh Hour triggers, putting a lore counter on itself
2. The Eleventh Hour's third chapter ability triggers, creating a token copy of Vizier of Tumbling Sands that is a legendary creature named Prisoner Zero
3. Activate Ioreth of the Healing House's second ability by tapping it, untapping Prisoner Zero and any other legendary creature
4. Activate Prisoner Zero by tapping it, untapping Ioreth of the Healing House
5. Repeat from step 3

Results

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