Cavalier of Night, Activated Sleeper, and Viscera Seer

Prerequisites

• Cavalier of Night on the battlefield
• Activated Sleeper in the graveyard
• Viscera Seer on the battlefield

Steps

1. Activate Viscera Seer by sacrificing Cavalier of Night
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, it triggers; choose not to sacrifice a creature
4. Activate Viscera Seer by sacrificing Activated Sleeper
5. When Activated Sleeper dies, it triggers, returning Activated Sleeper 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. Resolve the Viscera Seer ability from step 4, causing you to scry 1
8. Repeat from step 4

Results

• Infinite death triggers
• Infinite ETB
• Infinite LTB
• Infinite sacrifice triggers
• Infinite scry 1