Hello very cool deck mate, thanks for sharing it !
Some good synergies in there, I made 2 changes though because I don't have the Colossus legendary, and I cut shadow word pain aswell, to add 1* Spirit of the Dead and 1*Wretched Reclaimer
I think Velen or bwonsamdi could fit also in there, I'll do more games with your list to see if my changes are worth it or not. :p
3