Nim Deathmantle, Ashnod's Altar, and Marionette Apprentice

Prerequisites

• Nim Deathmantle on the battlefield
• Ashnod's Altar on the battlefield
• Marionette Apprentice on the battlefield
• available

Steps

1. Activate Ashnod's Altar by sacrificing Marionette Apprentice, adding
2. When Marionette Apprentice dies, Nim Deathmantle triggers, causing you to pay to return Marionette Apprentice from your graveyard to the battlefield, and attach Nim Deathmantle to it
3. When Marionette Apprentice enters the battlefield, it triggers, creating a 1/1 Servo artifact creature token
4. Activate Ashnod's Altar by sacrificing the Servo, adding
5. When the Servo dies, Marionette Apprentice triggers, causing each opponent to lose 1 life
6. Repeat

Results

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