Yarus, Roar of the Old Gods, Karlov Watchdog, Carrion Feeder, and Coveted Falcon

Prerequisites

• Yarus, Roar of the Old Gods on the battlefield
• Karlov Watchdog on the battlefield
• Carrion Feeder on the battlefield
• Coveted Falcon on the battlefield
• available

Steps

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

Results

• Infinite LTB
• Infinite ETB
• Infinite sacrifice triggers
• Infinite death triggers
• Infinite +1/+1 counters on Carrion Feeder