Arni Metalbrow + Thousand-Faced Shadow + Cloudstone Curio + Priest of Urabrask

Prerequisites

• Priest of Urabrask does not have summoning sickness.

Steps

1. 1Declare Priest of Urabrask as an attacker.
2. 2Arni Metalbrow triggers, causing you to pay to put Thousand-Faced Shadow from your hand onto the battlefield tapped and attacking.
3. 3When Thousand-Faced Shadow enters the battlefield, it, Arni Metalbrow and Cloudstone Curio trigger.
4. 4Resolve the Cloudstone Curio trigger, choosing to return nothing to your hand from the battlefield.
5. 5Resolve the Arni Metalbrow trigger, choosing not to pay.
6. 6Resolve the Thousand-Faced Shadow trigger, creating a token copy of Priest of Urabrask that enters the battlefield tapped and attacking.
7. 7When the Priest of Urabrask token enters the battlefield, it, Arni Metalbrow and Cloudstone Curio trigger.
8. 8Resolve the Priest of Urabrask trigger, adding .
9. 9Resolve the Cloudstone Curio trigger, returning Thousand-Faced Shadow to your hand from the battlefield.
10. 10Resolve the Arni Metalbrow trigger, causing you to pay to put Thousand-Faced Shadow from your hand onto the battlefield tapped and attacking.
11. 11Repeat from step 3.

Effects

• Infinite creature ETB
• Infinite creature LTB
• Infinite red mana
• Infinite tapped creature tokens that are attacking