Ratadrabik of Urborg, Leyline of Singularity, and Saffi Eriksdotter

Prerequisites

• Ratadrabik of Urborg on the battlefield
• Leyline of Singularity on the battlefield
• Saffi Eriksdotter on the battlefield

Steps

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

Results

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