Yarus, Roar of the Old Gods, Ashcloud Phoenix, and Bloodflow Connoisseur

Prerequisites

• Yarus, Roar of the Old Gods on the battlefield
• Ashcloud Phoenix on the battlefield
• Bloodflow Connoisseur on the battlefield
• Your life total is at least 2 greater than the largest life total among your opponents

Steps

1. Activate Bloodflow Connoisseur by sacrificing Ashcloud Phoenix
2. When Ashcloud Phoenix dies, its first ability triggers, returning it from your graveyard to the battlefield face-down
3. Resolve the Bloodflow Connoisseur ability, putting a +1/+1 counter on it
4. Activate Bloodflow Connoisseur by sacrificing Ashcloud Phoenix
5. Yarus' second ability triggers, returning Ashcloud Phoenix from your graveyard to the battlefield face down, and then turning it face up
6. Ashcloud Phoenix's second ability triggers, dealing 2 damage to each player
7. Resolve the Bloodflow Connoisseur ability, putting a +1/+1 counter on it
8. Repeat

Results

• Near-infinite +1/+1 counters on Bloodflow Connoisseur
• Near-infinite damage to all players
• Near-infinite death triggers
• Near-infinite ETB
• Near-infinite LTB
• Near-infinite sacrifice triggers