Tenacious Dead, Ashnod's Altar, Pitiless Plunderer, and Zulaport Cutthroat

Prerequisites

• Tenacious Dead on the battlefield
• Ashnod's Altar on the battlefield
• Pitiless Plunderer on the battlefield
• Zulaport Cutthroat on the battlefield

Steps

1. Sacrifice Tenacious Dead to Ashnod's Altar, generating
2. Pitiless Plunderer, Zulaport Cutthroat, and Tenacious Dead trigger; stack the triggers to resolve in that order
3. Pitiless Plunderer generates a Treasure token; crack it to float
4. Zulaport Cutthroat drains each opponent for 1
5. Resolve the Tenacious Dead trigger, paying to return it to the battlefield from the graveyard
6. Repeat the sacrifice-recursion loop, floating with each iteration and draining opponent infinitely with Zulaport Cutthroat triggers

Results

• Infinite colorless mana
• Infinite death triggers
• Infinite ETB
• Infinite lifegain
• Infinite lifegain triggers
• Infinite lifeloss
• Infinite LTB