Nim Deathmantle, Ashnod's Altar, and Gutter Grime

Prerequisites

• Nim Deathmantle on the battlefield
• Ashnod's Altar on the battlefield
• Gutter Grime on the battlefield
• You control at least one nontoken creature
• available

Steps

1. Activate Ashnod's Altar by sacrificing another nontoken creature, adding
2. The creature dies, triggering Nim Deathmantle and Gutter Grime
3. Resolve the Gutter Grime trigger, putting a slime counter on it and creating an X/X Ooze creature token
4. Resolve the Nim Deathmantle trigger, causing you to pay to return the nontoken creature from your graveyard to the battlefield, and attach Nim Deathmantle to it
5. Activate Ashnod's Altar by sacrificing the Ooze, adding
6. Repeat

Results

• Infinite death triggers
• Infinite ETB
• Infinite LTB
• Infinite sacrifice triggers
• Infinite slime counters on Gutter Grime