Thermopod, Putrid Goblin, and Thran Vigil

Prerequisites

• Thermopod on the battlefield
• Putrid Goblin on the battlefield
• Thran Vigil on the battlefield

Steps

1. Activate Thermopod by sacrificing Putrid Goblin
2. When Putrid Goblin dies, its persist ability triggers, returning it from your graveyard to the battlefield with a -1/-1 counter on it
3. Thran Vigil triggers, putting a +1/+1 counter on Putrid Goblin
4. Repeat

Results

• Infinite ETB
• Infinite LTB
• Infinite death triggers
• Infinite red mana
• Infinite sacrifice triggers