Yarus, Roar of the Old Gods + Karlov Watchdog + Altar of Dementia + Coveted Falcon

Prerequisites

• You control a face-down creature whose front face is a permanent card.
• Your deck size is at least 2.

Steps

1. 1Activate Coveted Falcon by paying , turning it face up.
2. 2Coveted Falcon triggers, causing an opponent to gain control of Karlov Watchdog and causing you to draw a card.
3. 3During the opponent's turn, activate Altar of Dementia by sacrificing a face-down creature you control.
4. 4When 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.
5. 5Resolve the Altar of Dementia ability.
6. 6Repeat from step 3.

Effects

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