Xathrid Necromancer, Maskwood Nexus, and Carrion Feeder

Prerequisites

• Xathrid Necromancer on the battlefield
• Maskwood Nexus on the battlefield
• Carrion Feeder on the battlefield
• You control at least one additional creature

Steps

1. Activate Carrion Feeder by sacrificing any other creature
2. The creature dies, triggering Xathrid Necromancer, creating a 2/2 Zombie creature token
3. Resolve the Carrion Feeder ability, putting a +1/+1 counter on it
4. Repeat

Results

• Infinite +1/+1 counters on Carrion Feeder
• Infinite death triggers
• Infinite ETB
• Infinite LTB
• Infinite sacrifice triggers