Missy, Phyrexian Altar, and Frontline Strategist

Prerequisites

• Missy on the battlefield
• Phyrexian Altar on the battlefield
• Frontline Strategist on the battlefield

Steps

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

Results

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