Gyruda, Doom of Depths, Mortuary, and Phantasmal Image

Prerequisites

• Gyruda, Doom of Depths on the battlefield
• Mortuary on the battlefield
• Phantasmal Image in hand
• available

Steps

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