Emry, Lurker of the Loch + Displacer Kitten + Urabrask the Hidden + Dark Sphere

Emry, Lurker of the Loch

Displacer Kitten

Urabrask the Hidden

Dark Sphere

How it works

1. Activate Emry by tapping it, allowing you to cast Dark Sphere from your graveyard.
2. Cast Dark Sphere by paying 0.
3. Displacer Kitten triggers, blinking Emry.
4. When Emry enters, it triggers, causing you to mill four cards.
5. Activate Dark Sphere by tapping and sacrificing it.
6. Repeat.

This loop relies on Emry, Lurker of the Loch pulling Dark Sphere directly from your graveyard with her tap ability, letting you recast the artifact for zero mana. Every time you cast that noncreature spell, Displacer Kitten's trigger blinks Emry to reset her tap ability while simultaneously feeding endless artifact entry, leave-the-battlefield, and sacrifice triggers. Meanwhile, Urabrask the Hidden ensures Emry enters the battlefield with haste so she can immediately retap, and milling yourself four times per iteration guarantees you’ll never run out of fodder for the engine.