Nim Deathmantle, Ashnod's Altar, and Ogre Slumlord

Prerequisites

• Nim Deathmantle on the battlefield
• Ashnod's Altar on the battlefield
• Ogre Slumlord on the battlefield
• You control another nontoken creature

Steps

1. Activate Ashnod's Altar by sacrificing another creature, adding
2. The creature dies, triggering Ogre Slumlord and Nim Deathmantle
3. Resolve the Ogre Slumlord trigger, creating a 1/1 Rat creature token
4. Activate Ashnod's Altar by sacrificing the Rat, adding
5. Resolve the Nim Deathmantle trigger from step 2, causing you to pay to return the creature from your graveyard to the battlefield, and attach Nim Deathmantle to it
6. Repeat

Results

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