Ratadrabik of Urborg, Leyline of Singularity, and Ravenous Rotbelly

Prerequisites

• Ratadrabik of Urborg on the battlefield
• Leyline of Singularity on the battlefield
• Ravenous Rotbelly in hand
• available

Steps

1. Cast Ravenous Rotbelly by paying its mana cost
2. When Ravenous Rotbelly enters, it triggers, causing you to sacrifice it and each opponent to sacrifice a creature
3. When Ravenous Rotbelly dies, Ratadrabik triggers, creating a token copy of Ravenous Rotbelly that is a 2/2 legendary Zombie in addition to its other types
4. Repeat from step 2 using the Ravenous Rotbelly token instead

Results

• Each opponent sacrifices all creatures they control
• Infinite ETB
• Infinite LTB
• Infinite death triggers
• Infinite sacrifice triggers