Polukranos Reborn // Polukranos, Engine of Ruin, Nim Deathmantle, and Ashnod's Altar

Prerequisites

• Polukranos Reborn // Polukranos, Engine of Ruin on the battlefield
• Nim Deathmantle on the battlefield
• Ashnod's Altar on the battlefield
• You control at least two additional nontoken Hydras
• Polukranos on the battlefield as Polukranos, Engine of Ruin

Steps

1. Activate Ashnod's Altar by sacrificing another nontoken Hydra that does not have Nim Deathmantle attached, adding
2. When the Hydra dies, Polukranos and Nim Deathmantle trigger
3. Resolve the Polukranos trigger, creating two 3/3 Phyrexian Hydra creature tokens
4. Activate Ashnod's Altar by sacrificing a Phyrexian Hydra, adding
5. Resolve the Nim Deathmantle trigger from step 2, causing you to pay to return the nontoken Hydra from your graveyard to the battlefield, and attach Nim Deathmantle to it
6. Repeat

Results

• Infinite colored mana
• Infinite creature tokens
• Infinite death triggers
• Infinite ETB
• Infinite LTB
• Infinite sacrifice triggers
• Infinite colorless mana