Ratadrabik of Urborg, Leyline of Singularity, and Ashnod's Altar

Prerequisites

• Ratadrabik of Urborg on the battlefield
• Leyline of Singularity on the battlefield
• Ashnod's Altar on the battlefield
• You control at least one additional creature

Steps

1. Activate Ashnod's Altar by sacrificing any other creature you control, adding
2. The creature dies, triggering Ratadrabik, creating a token copy of the creature that is a 2/2 legendary Zombie in addition to its other types
3. Repeat

Results

• Infinite colorless mana
• Infinite death triggers
• Infinite ETB
• Infinite LTB
• Infinite sacrifice triggers