Cayth, Famed Mechanist, Nim Deathmantle, and Krark-Clan Ironworks

Prerequisites

• Cayth, Famed Mechanist on the battlefield
• Nim Deathmantle on the battlefield
• Krark-Clan Ironworks on the battlefield
• You control at least one nontoken artifact creature
• available

Steps

1. Activate Krark-Clan Ironworks by sacrificing a nontoken artifact creature, adding
2. When the creature dies, Nim Deathmantle triggers, causing you to pay to return the creature from your graveyard to the battlefield, and attach Nim Deathmantle to it
3. When the creature enters the battlefield, its fabricate ability triggers, creating a 1/1 Servo artifact creature token
4. Activate Krark-Clan Ironworks by sacrificing the Servo, adding
5. Repeat

Results

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