Cavalier of Night, Paleontologist's Pick-Axe // Dinosaur Headdress, Priest of Gix, and Altar of Dementia

Prerequisites

• Cavalier of Night in exile
• Paleontologist's Pick-Axe // Dinosaur Headdress on the battlefield
• Priest of Gix on the battlefield
• Altar of Dementia on the battlefield
• Paleontologist's Pick-Axe on the battlefield as Dinosaur Headdress
• Cavalier of Night exiled by Dinosaur Headdress
• available

Steps

1. Activate Dinosaur Headdress' equip ability by paying , attaching it to Priest of Gix and causing Priest of Gix to become a copy of Cavalier of Night
2. Activate Altar of Dementia by sacrificing Priest of Gix
3. When Priest of Gix dies, its second ability triggers, returning itself from your graveyard to the battlefield
4. When Priest of Gix enters the battlefield, it triggers, adding
5. Resolve the Altar of Dementia ability, causing target player to mill cards equal to Priest of Gix's power
6. Repeat

Results

• Infinite black mana
• Infinite death triggers
• Infinite ETB
• Infinite LTB
• Infinite mill
• Infinite sacrifice triggers
• Infinite self-mill