Prerequisites
- Activated Sleeper in your graveyard
- Altar of Dementia on the battlefield
- Cavalier of Night on the battlefield
Steps
- Activate Altar of Dementia by sacrificing Cavalier of Night
- When Cavalier of Night dies, it triggers, returning Activated Sleeper from your graveyard to the battlefield as a copy of Cavalier of Night
- When Activated Sleeper enters the battlefield, it triggers; choose not to sacrifice a creature
- Activate Altar of Dementia by sacrificing Activated Sleeper
- When Activated Sleeper dies, it triggers, returning Activated Sleeper from your graveyard to the battlefield as a copy of Cavalier of Night
- When Activated Sleeper enters the battlefield, it triggers; choose not to sacrifice a creature
- Resolve the Altar of Dementia ability from step 4, causing target player to mill cards equal to Activated Sleeper's power
- Repeat from step 4
Results
- Infinite death triggers
- Infinite ETB
- Infinite LTB
- Infinite mill
- Infinite sacrifice triggers
- Infinite self-mill
Required Cards 3
Activated Sleeper
Creature — Phyrexian Shapeshifter
Cavalier of Night
Creature — Elemental Knight