Infinite creature ETBInfinite creature LTBInfinite red manaInfinite tapped creature tokens that are attacking
How it works
Declare Priest of Urabrask as an attacker.
Arni Metalbrow triggers, causing you to pay 1 to put Thousand-Faced Shadow from your hand onto the battlefield tapped and attacking.
When Thousand-Faced Shadow enters the battlefield, it, Arni Metalbrow and Cloudstone Curio trigger.
Resolve the Cloudstone Curio trigger, choosing to return nothing to your hand from the battlefield.
Resolve the Arni Metalbrow trigger, choosing not to pay.
Resolve the Thousand-Faced Shadow trigger, creating a token copy of Priest of Urabrask that enters the battlefield tapped and attacking.
When the Priest of Urabrask token enters the battlefield, it, Arni Metalbrow and Cloudstone Curio trigger.
Resolve the Priest of Urabrask trigger, adding .
Resolve the Cloudstone Curio trigger, returning Thousand-Faced Shadow to your hand from the battlefield.
Resolve the Arni Metalbrow trigger, causing you to pay 1 to put Thousand-Faced Shadow from your hand onto the battlefield tapped and attacking.
Repeat from step 3.
This clever loop is ignited when you send Priest of Urabrask into battle, using its entry mana to fund Arni Metalbrow’s ability and sneak Thousand-Faced Shadow directly into the fray. As the Shadow enters, its triggered ability marshals a fresh Priest of Urabrask token copy, while Cloudstone Curio stands ready to bounce the original Ninja right back to your hand. Each iteration of this dance lets the Priest token flood your pool with red mana—effortlessly paying the {1}{R} toll to redeploy Thousand-Faced Shadow and repeat the cycle for an unstoppable army of attacking attackers.