Missy, Nim Deathmantle, and Ashnod's Altar

Prerequisites

• Missy on the battlefield
• Nim Deathmantle on the battlefield
• Ashnod's Altar on the battlefield
• You control another nontoken nonartifact creature

Steps

1. Activate Ashnod's Altar by sacrificing another nontoken nonartifact creature, adding
2. When the creature dies, Nim Deathmantle and Missy's first ability triggers
3. Resolve the Nim Deathmantle trigger, choosing not to pay
4. Resolve the Missy trigger, returning the creature from your graveyard to the battlefield face down as a 2/2 Cyberman artifact creature
5. Activate Ashnod's Altar by sacrificing the Cyberman, adding
6. When the Cyberman dies, Nim Deathmantle triggers, causing you to pay to return the creature from your graveyard to the battlefield face up, and attach Nim Deathmantle to it
7. Repeat

Results

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