Fain, the Broker, Intruder Alarm, Pitiless Plunderer, and Thermopod

Prerequisites

• Fain, the Broker on the battlefield
• Intruder Alarm on the battlefield
• Pitiless Plunderer on the battlefield
• Thermopod on the battlefield
• Fain does not have summoning sickness
• You control at least one additional artifact

Steps

1. Activate Fain's third ability by tapping it and sacrificing another artifact, creating a 2/1 Inkling creature token
2. When the Inkling enters the battlefield, Intruder Alarm triggers, untapping all creatures
3. Activate Thermopod's second ability by sacrificing the Inkling, adding
4. When the Inkling dies, Pitiless Plunderer triggers, creating a Treasure token
5. Repeat

Results

• Infinite LTB
• Infinite ETB
• Infinite sacrifice triggers
• Infinite death triggers
• Infinite red mana
• Infinite untap of all creatures
• Infinite mana creatures you control can produce