Shadowed Spirit made me try to put together a Deathrattle Priest for Standard. I also really like the Shadow Priest flavor, and since both archetypes lack enough support to be viable on their own as of now, why not combine them?

The goal of this deck is to pester your opponent with Deathrattle minions like Reliquary of Souls, Shadowed Spirit and Nerubian Egg until at least one of them sticks and you can start multiplying and buffing them with Gift of Luminance, Psyche Split, Apotheosis and Defender of Argus. Vectus and Raise Dead for reload, Thrive in the Shadows, Loot Hoarder and Bloodmage Thalnos for draw, the rest is mostly board control.

The deck is far from optimized yet so if you have any ideas how to improve it, please let me know in the comments!