Dual Nature, Rot Hulk, and Phyrexian Altar

Prerequisites

• Dual Nature on the battlefield
• Rot Hulk in hand
• Phyrexian Altar on the battlefield
• available

Steps

1. Cast Rot Hulk by paying
2. Rot Hulk enters the battlefield, triggering itself and Dual Nature
3. Holding priority, activate Phyrexian Altar by sacrificing Rot Hulk, adding one mana of any color
4. Dual Nature's second ability triggers, exiling all tokens named Rot Hulk
5. Resolve the Rot Hulk trigger from step 2, failing to return anything to the battlefield
6. Resolve the Dual Nature trigger from step 2, creating a token copy of Rot Hulk
7. The token copy of Rot Hulk enters the battlefield, returning Rot Hulk from your graveyard to the battlefield
8. Repeat from step 2

Results

• Infinite colored mana
• Infinite death triggers
• Infinite ETB
• Infinite LTB
• Infinite sacrifice triggers
• Return all Zombies from your graveyard to the battlefield