Xathrid Necromancer, Maskwood Nexus, and Ashnod's Altar

Prerequisites

• Xathrid Necromancer on the battlefield
• Maskwood Nexus on the battlefield
• Ashnod's Altar on the battlefield
• You control at least one additional creature

Steps

1. Activate Ashnod's Altar by sacrificing any other creature, adding
2. The creature dies, triggering Xathrid Necromancer, creating a 2/2 Zombie creature token
3. Repeat

Results

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