Cauldron of Souls, Zealous Conscripts, Verdurous Gearhulk, and Thermopod

Prerequisites

• Cauldron of Souls on the battlefield
• Zealous Conscripts on the battlefield
• Verdurous Gearhulk on the battlefield
• Thermopod 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 Thermopod's second ability by sacrificing Zealous Conscripts, adding
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 Thermopod's second ability by sacrificing Verdurous Gearhulk, adding
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 death triggers
• Infinite ETB
• Infinite LTB
• Infinite red mana
• Infinite sacrifice triggers