Cauldron of Souls, Zealous Conscripts, Verdurous Gearhulk, and Phyrexian Altar

Prerequisites

• Cauldron of Souls on the battlefield
• Zealous Conscripts on the battlefield
• Verdurous Gearhulk on the battlefield
• Phyrexian Altar on the battlefield
• Zealous Conscripts and Verduous Gearhulk do not have a -1/-1 counter on them

Steps

1. Activate Cauldron of Souls by tapping it, giving Verdurous Gearhulk and Zealous Conscripts persist until end of turn
2. Activate Phyrexian Altar by sacrificing Zealous Conscripts, adding one mana of any color
3. When Zealous Conscripts dies, its persist ability triggers, returning itself from your graveyard to the battlefield with a -1/-1 counter on it
4. When Zealous Conscripts enters the battlefield, it triggers, untapping Cauldron of Souls
5. Activate Phyrexian Altar by sacrificing Verdurous Gearhulk, adding one mana of any color
6. When Verdurous Gearhulk dies, its persist ability triggers, returning itself from your graveyard to the battlefield with a -1/-1 counter on it
7. When Verdurous Gearhulk enters the battlefield, it triggers, putting a +1/+1 counter on itself and Zealous Conscripts, and two +1/+1 counters on any other creature(s) you control
8. Repeat

Results

• Infinite +1/+1 counters on all other creatures you control
• Infinite colored mana
• Infinite death triggers
• Infinite ETB
• Infinite LTB
• Infinite sacrifice triggers