Ratadrabik of Urborg, Nim Deathmantle, and Ashnod's Altar

Prerequisites

• Ratadrabik of Urborg on the battlefield
• Nim Deathmantle on the battlefield
• Ashnod's Altar on the battlefield
• You control another nontoken legendary creature

Steps

1. Activate Ashnod's Altar by sacrificing another legendary creature you control, adding
2. The creature dies, triggering Ratadrabik and Nim Deathmantle
3. Resolve the Ratadrabik trigger, creating a nonlegendary token copy of the creature that is a 2/2 Zombie in addition to its other types
4. Activate Ashnod's Altar by sacrificing the Zombie, adding
5. Resolve the Nim Deathmantle trigger from step 2, returning the legendary creature from your graveyard to the battlefield, and attaching Nim Deathmantle to it
6. Repeat

Results

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