Yarus, Roar of the Old Gods, Ashcloud Phoenix, and Phyrexian Altar

Prerequisites

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

Steps

1. Activate Phyrexian Altar by sacrificing Ashcloud Phoenix, adding one mana of any color
2. When Ashcloud Phoenix dies, its first ability triggers, returning it from your graveyard to the battlefield face-down
3. Activate Phyrexian Altar by sacrificing Ashcloud Phoenix, adding one mana of any color
4. Yarus' second ability triggers, returning Ashcloud Phoenix from your graveyard to the battlefield face down, and then turning it face up
5. Ashcloud Phoenix's second ability triggers, dealing 2 damage to each player
6. Repeat

Results

• Near-infinite colored mana
• Near-infinite damage to all players
• Near-infinite death triggers
• Near-infinite ETB
• Near-infinite LTB
• Near-infinite sacrifice triggers