Missy, Phyrexian Altar, and Gudul Lurker

Prerequisites

• Missy on the battlefield
• Phyrexian Altar on the battlefield
• Gudul Lurker on the battlefield

Steps

1. Activate Phyrexian Altar by sacrificing Gudul Lurker, adding
2. When Gudul Lurker dies, Missy's first ability triggers, returning Gudul Lurker from your graveyard to the battlefield face down as a 2/2 Cyberman artifact creature
3. Activate Gudul Lurker's morph ability by paying , turning it face up
4. Repeat

Results

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