Activate Emry by tapping it, allowing you to cast Lotus Petal from your graveyard.
Cast Lotus Petal by paying 0.
Displacer Kitten triggers, blinking Emry.
When Emry enters, it triggers, causing you to mill four cards.
Activate Lotus Petal by tapping and sacrificing it.
Repeat.
This clever loop turns the graveyard into an engine by leveraging Emry, Lurker of the Loch to repeatedly pull Lotus Petal back into play. With Urabrask the Hidden granting your creatures haste, Emry is ready to tap immediately as she re-enters the battlefield, allowing the cycle to start anew. Meanwhile, every time you cast the zero-cost Lotus Petal from your graveyard, Displacer Kitten's avoidance ability blinks Emry to reset her tap ability and fuel an infinite loop of mana, self-mill, and artifact triggers.