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

Prerequisites

• Cavalier of Night in exile
• Paleontologist's Pick-Axe // Dinosaur Headdress on the battlefield
• Priest of Gix on the battlefield
• Phyrexian Altar 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 Phyrexian Altar by sacrificing Priest of Gix, adding one mana of any color
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. Repeat

Results

• Infinite colored mana
• Infinite death triggers
• Infinite ETB
• Infinite LTB
• Infinite sacrifice triggers