Activate Emry by tapping it, allowing you to cast Lion's Eye Diamond from your graveyard.
Cast Lion's Eye Diamond by paying 0.
Displacer Kitten triggers, blinking Emry.
When Emry enters, it triggers, causing you to mill four cards.
Activate Lion's Eye Diamond by discarding your hand and sacrificing it.
Repeat.
This mesmerizing transmutation hinges on a clever feedback loop: by repeatedly recasting Lion's Eye Diamond from your graveyard using Emry, Lurker of the Loch's tap ability, you generate a surge of mana while triggering Displacer Kitten. Each time you cast the artifact, the Kitten blinks Emry away and right back onto the battlefield, refreshing her tap ability and enabling the loop to begin anew. Samut, Voice of Dissent quietly pieces this alchemical engine together from the sidelines, using her activated ability to untap Emry (or simply lending her flash and haste to the setup, keeping your reagents moving at optimal speed).