Nim Deathmantle, Phyrexian Altar, and Mitotic Slime

Prerequisites

• Nim Deathmantle on the battlefield
• Phyrexian Altar on the battlefield
• Mitotic Slime on the battlefield

Steps

1. Activate Phyrexian Altar by sacrificing Mitotic Slime, adding
2. Mitotic Slime dies, triggering itself and Nim Deathmantle
3. Resolve the Mitotic Slime trigger, creating two 2/2 Ooze creature tokens
4. Activate Phyrexian Altar by sacrificing an Ooze, adding
5. The Ooze dies, creating two 1/1 Ooze creature tokens
6. Activate Phyrexian Altar twice by sacrificing two Oozes, adding
7. Resolve the Nim Deathmantle trigger from step 2, causing you to pay to return Mitotic Slime from your graveyard to the battlefield, and attach Nim Deathmantle to it
8. Repeat

Results

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