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 clever loop centers on Emry, Lurker of the Loch, whose affinity for artifacts and tap ability let you repeatedly pull Delif's Cone straight from your graveyard for zero mana. Every time you cast that artifact, Displacer Kitten's avoidance trigger blinks Emry, resetting her tap ability upon re-entry while simultaneously churning through your library thanks to her self-mill trigger. Concordant Crossroads ensures Emry is ready to go immediately without summoning sickness, tying the whole engine together for infinite artifact sacrifices and storm count.