Nim Deathmantle, Ashnod's Altar, and Propeller Pioneer

Prerequisites

• Nim Deathmantle on the battlefield
• Ashnod's Altar on the battlefield
• Propeller Pioneer on the battlefield
• available

Steps

1. Activate Ashnod's Altar by sacrificing Propeller Pioneer, adding
2. When Propeller Pioneer dies, Nim Deathmantle triggers, causing you to pay to return Propeller Pioneer from your graveyard to the battlefield, and attach Nim Deathmantle to it
3. When Propeller Pioneer enters the battlefield, its fabricate ability triggers, creating a 1/1 Servo artifact creature token
4. Activate Ashnod's Altar by sacrificing the Servo, adding
5. Repeat

Results

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