Xathrid Necromancer, Conspiracy, and Phyrexian Altar

Prerequisites

• Xathrid Necromancer on the battlefield
• Conspiracy on the battlefield
• Phyrexian Altar on the battlefield
• "Human" chosen with Conspiracy
• You control at least one other creature

Steps

1. Activate Phyrexian Altar by sacrificing any other creature, adding one mana of any color
2. Xathrid Necromancer triggers, creating a 2/2 Zombie creature token
3. Repeat

Results

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