Yarus, Roar of the Old Gods + Karlov Watchdog + Altar of Dementia + Iroh, Tea Master

Prerequisites

• You control a face-down creature whose front face is a permanent card.

Steps

1. 1Donate Karlov Watchdog to an opponent.
2. 2During the opponent's turn, activate Altar of Dementia by sacrificing a face-down creature you control.
3. 3When the creature dies, Yarus's second ability triggers, returning it from your graveyard to the battlefield face-down as a 2/2 creature, and then not turning it face-up due to Karlov Watchdog.
4. 4Resolve the Altar of Dementia ability.
5. 5Repeat from step 2.

Effects

• Infinite creature ETB
• Infinite creature LTB
• Infinite creature sacrifice triggers
• Infinite death triggers
• Infinite mill
• Infinite self-mill