Missy, Phyrexian Altar, and Grim Haruspex

Prerequisites

• Missy on the battlefield
• Phyrexian Altar on the battlefield
• Grim Haruspex on the battlefield

Steps

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

Results

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