Ratadrabik of Urborg, Leyline of Singularity, and Phyrexian Dreadnought

Prerequisites

• Ratadrabik of Urborg on the battlefield
• Leyline of Singularity on the battlefield
• Phyrexian Dreadnought in hand
• available

Steps

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

Results

• Infinite death triggers
• Infinite creature ETB
• Infinite creature LTB
• Infinite creature sacrifice triggers