Xathrid Necromancer, Artificial Evolution, and Ashnod's Altar

Prerequisites

• Xathrid Necromancer on the battlefield
• Artificial Evolution in hand
• Ashnod's Altar on the battlefield
• You control at least one additional Human
• available

Steps

1. Cast Artificial Evolution by paying , changing all instances of "Zombie" on Xathrid Necromancer to "Human" until end of turn
2. Activate Ashnod's Altar by sacrificing any other Human, adding
3. Xathrid Necromancer triggers, creating a 2/2 Human creature token
4. Repeat from step 2

Results

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