Rakdos, the Muscle + Priest of Gix + Haunted Crossroads + Pawn of Ulamog + Phantom Train

Rakdos, the Muscle

Priest of Gix

Haunted Crossroads

Pawn of Ulamog

Phantom Train

How it works

1. Activate Phantom Train by sacrificing Priest of Gix.
2. When Priest of Gix dies, Pawn of Ulamog and Rakdos trigger.
3. Resolve the Pawn of Ulamog trigger, creating a 0/1 Eldrazi Spawn creature token.
4. Holding priority, activate Haunted Crossroads by paying , putting Priest of Gix from your graveyard onto the top of your library.
5. 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.
6. Resolve the Phantom Train ability from step 1, putting a +1/+1 counter on it.
7. Activate the Eldrazi Spawn by sacrificing it, adding C.
8. Cast Priest of Gix from exile by paying 3.
9. When Priest of Gix enters the battlefield, it triggers, adding .
10. Repeat.

This intricate engine relies on Phantom Train to continually sacrifice Priest of Gix, which funds its own return by generating mana on entry while Pawn of Ulamog provides the extra token fodder needed to sustain the loop. At the same time, Haunted Crossroads lets you continuously recycle the Priest right back to the top of your library so Rakdos, the Muscle can trigger off each sacrifice to exile your entire library and let you play all of it for free using any type of mana.