Ratadrabik of Urborg, Leyline of Singularity, and Extruder

Prerequisites

• Ratadrabik of Urborg on the battlefield
• Leyline of Singularity on the battlefield
• Extruder on the battlefield

Steps

1. Activate Extruder by sacrificing it
2. When Extruder dies, Ratadrabik triggers, creating a token copy of Extruder that is a 2/2 legendary Zombie in addition to its other types
3. Resolve the Extruder ability
4. Repeat using the Extruder token

Results

• Infinite +1/+1 counters on creatures you control
• Infinite ETB
• Infinite LTB
• Infinite death triggers
• Infinite sacrifice triggers