Activate Emry by tapping it, allowing you to cast Delif's Cone from your graveyard.
Cast Delif's Cone by paying 0.
Displacer Kitten triggers, blinking Emry.
When Emry enters, it triggers, causing you to mill four cards.
Activate Delif's Cone by tapping and sacrificing it.
Repeat.
This intricate loop transforms a humble artifact like Delif's Cone into a relentless engine of self-mill and sacrifice triggers. With Samut, Voice of Dissent granting haste and providing the white mana and active tapping needed to continuously untap Emry, Lurker of the Loch, you can repeatedly recast the Cone from your graveyard. Every time you cast that noncreature spell, Displacer Kitten triggers to blink Emry, resetting her enter-the-battlefield ability to mill away your library four cards at a time.