Activate Emry by tapping it, allowing you to cast Dark Sphere from your graveyard.
Cast Dark Sphere by paying 0.
Displacer Kitten triggers, blinking Emry.
When Emry enters, it triggers, causing you to mill four cards.
Activate Dark Sphere by tapping and sacrificing it.
Repeat.
This intricate loop relies on the synergy between Emry, Lurker of the Loch and Displacer Kitten to recycle cheap artifacts directly from the graveyard. By casting Dark Sphere for zero mana, you trigger Displacer Kitten's blink ability to reset Emry, allowing her tap ability to continually pull Dark Sphere right back out of your graveyard. Meanwhile, Akroma's Memorial sits safely on the battlefield providing passive keyword soup, while Dark Sphere's own sacrifice effect fuels an endless loop of artifact triggers and self-mill.