Gyruda, Doom of Depths, Mortuary, and Phyrexian Metamorph

Prerequisites

• Gyruda, Doom of Depths on the battlefield
• Mortuary on the battlefield
• Phyrexian Metamorph in hand
• available

Steps

1. Cast Phyrexian Metamorph by paying , having it enter the battlefield as a copy of Gyruda
2. Put Phyrexian Metamorph into your graveyard due to the legend rule
3. Mortuary triggers, putting Phyrexian Metamorph on top of your library from your graveyard
4. Phyrexian Metamorph's enter the battlefield ability triggers, causing each player to mill four cards and you to return Phyrexian Metamorph from your graveyard to the battlefield as a copy of Gyruda
5. Repeat from step 2

Results

• Infinite death triggers
• Infinite ETB
• Infinite LTB
• Infinite mill
• Infinite sacrifice triggers
• Infinite self-mill