Missy, Phyrexian Altar, and Coral Trickster

Prerequisites

• Missy on the battlefield
• Phyrexian Altar on the battlefield
• Coral Trickster on the battlefield

Steps

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

Results

• Infinite death triggers
• Infinite ETB
• Infinite LTB
• Infinite mana permanents you control can produce
• Infinite sacrifice triggers
• Infinite untap of permanents you control