Cavalier of Night, Activated Sleeper, and Thermopod

Prerequisites

• Cavalier of Night on the battlefield
• Activated Sleeper in the graveyard
• Thermopod on the battlefield

Steps

1. Activate Thermopod by sacrificing Cavalier of Night, adding
2. When Cavalier of Night dies, it triggers, returning Activated Sleeper from your graveyard to the battlefield as a copy of Cavalier of Night
3. When Activated Sleeper enters the battlefield, its first triggered ability from Cavalier of Night triggers; choose not to sacrifice a creature
4. Activate Thermopod by sacrificing Activated Sleeper, adding
5. When Activated Sleeper dies, its last ability from Cavalier of Night triggers, returning itself from your graveyard to the battlefield as a copy of Cavalier of Night
6. When Activated Sleeper enters the battlefield, it triggers; choose not to sacrifice a creature
7. Repeat from step 5

Results

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