Missy, Phyrexian Altar, and Warbreak Trumpeter

Prerequisites

• Missy on the battlefield
• Phyrexian Altar on the battlefield
• Warbreak Trumpeter on the battlefield

Steps

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

Results

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