Cavalier of Night, Glasspool Mimic // Glasspool Shore, and Yahenni, Undying Partisan

Prerequisites

• Cavalier of Night on the battlefield
• Glasspool Mimic // Glasspool Shore on the battlefield
• Yahenni, Undying Partisan on the battlefield

Steps

1. Activate Yahenni, Undying Partisan by sacrificing Glasspool Mimic
2. When Glasspool Mimic dies, its last ability from Cavalier of Night triggers, returning itself from your graveyard to the battlefield as a copy of Cavalier of Night
3. When Glasspool Mimic enters the battlefield, its first triggered ability from Cavalier of Night triggers; choose not to sacrifice a creature
4. Resolve the Yahenni, Undying Partisan ability from step 1
5. Repeat

Results

• Infinite death triggers
• Infinite ETB
• Infinite LTB
• Infinite sacrifice triggers