Shouldn't this be a possession or artifact?
Yeah, I chose to go with condition because of how I worded The Witch King. I suppose I could make it a possession that plays to your support area and change the Witch King's wording? I'm open to suggestions!
By the way it's OP since it's only 1 cost and non-unique...You could just not have it have to do with the Witch King, since it pumps all Wraiths, and make it an artifact that plays to your support area and works kind of like Hides from TT set (which is a possession in the support area, similar enough to artifact)and maybe Goblin Armory from 1st set... the artifact could be unique, cost like 2 or 3, and have the game text, "Wraith minions are Strength +1... Shadow: If a wraith is about to take a wound, remove (3) to prevent that wound... AND, Shadow: remove (6) to play a Wraith from your draw deck or discard pile."