Xathrid Necromancer, Phyrexian Altar, and Leyline of Transformation

Prerequisites

• Xathrid Necromancer on the battlefield
• Phyrexian Altar on the battlefield
• Leyline of Transformation on the battlefield

Steps

1. Activate Phyrexian Altar by sacrificing any other creature
2. When the creature dies as a Human due to Leyline of Transformation, Xathrid Necromancer triggers, creating a 2/2 Zombie creature token
3. Repeat

Results

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