Gogo, Mysterious Mime + Ioreth of the Healing House

Prerequisites

• There is at least one other legendary creature on the battlefield.

Steps

1. 1At the beginning of your combat phase, Gogo triggers, causing it to become a copy of Ioreth until end of turn, and giving Gogo and Ioreth haste until end of turn.
2. 2Activate Gogo's second ability by tapping it, untapping Ioreth and another legendary creature.
3. 3Activate Ioreth's second ability by tapping it, untapping Gogo and another legendary creature.
4. 4Repeat from step 2.

Effects

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