Cavalier of Night, Activated Sleeper, and Woe Strider

Prerequisites

• Cavalier of Night on the battlefield
• Activated Sleeper in the graveyard
• Woe Strider on the battlefield

Steps

1. Activate Woe Strider 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, its first triggered ability from Cavalier of Night triggers; choose not to sacrifice a creature
4. Resolve the Woe Strider ability from step 1
5. Activate Woe Strider by sacrificing Activated Sleeper
6. 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
7. When Activated Sleeper enters the battlefield, it triggers; choose not to sacrifice a creature
8. Resolve the Woe Strider ability from step 5
9. Repeat from step 5

Results

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