Rakdos, the Muscle + Priest of Gix + Haunted Crossroads + Woe Strider + Cloud Key

Rakdos, the Muscle

Priest of Gix

Haunted Crossroads

Woe Strider

Cloud Key

How it works

1. Activate Woe Strider by sacrificing Priest of Gix.
2. When Priest of Gix dies, Rakdos triggers.
3. Holding priority, activate Haunted Crossroads by paying , putting Priest of Gix from your graveyard onto the top of your library.
4. Resolve the Rakdos trigger, causing you to exile the top three cards of your library with the ability to play them until your next end step.
5. Resolve the Woe Strider ability from step 1, causing you to scry 1.
6. Cast Priest of Gix from exile by paying 2.
7. When Priest of Gix enters the battlefield, it triggers, adding .
8. Repeat.

This elegant loop relies on Cloud Key naming "creature" to reduce the casting cost of Priest of Gix down to a mere two black mana, perfectly matching the three mana it generates upon entering the battlefield. Woe Strider provides a reliable outlet to sacrifice the Priest while letting you scry through your library, and Haunted Crossroads recycles the Priest right back to the top of your deck just in time to be exiled by Rakdos, the Muscle. As you continuously loop this sacrifice and resurrection cycle, Rakdos's triggered ability lets you exile and subsequently cast your entire library while generating infinite death triggers and scries.