Cayth, Famed Mechanist, Nim Deathmantle, and Ashnod's Altar

Prerequisites

• Cayth, Famed Mechanist on the battlefield
• Nim Deathmantle on the battlefield
• Ashnod's Altar on the battlefield
• available

Steps

1. Activate Ashnod's Altar by sacrificing Cayth, adding
2. When Cayth dies, Nim Deathmantle triggers, causing you to pay to return Cayth from your graveyard to the battlefield, and attach Nim Deathmantle to it
3. When Cayth 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