Emry, Lurker of the Loch + Displacer Kitten + Concordant Crossroads + Tormod's Crypt

Emry, Lurker of the Loch

Displacer Kitten

Concordant Crossroads

Tormod's Crypt

How it works

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

This infinite loop relies on Emry, Lurker of the Loch pulling Tormod's Crypt straight out of your graveyard over and over again, fueled by her tap ability. Because Tormod's Crypt costs zero mana to cast, playing it triggers Displacer Kitten to blink Emry, resetting her tap ability and triggering a fresh mill of four cards upon her return. Meanwhile, Concordant Crossroads ensures Emry doesn't suffer from summoning sickness and can tap immediately on each iteration to restart the cycle. By repeatedly casting, sacrificing, and exiling the same zero-mana artifact, you cycle through your entire deck while generating an endless stream of enters-the-battlefield and artifact sacrifice triggers.