As long as its not an EC army, you may. Technicly it would be a black legion army with LOTS of slanneshi marked units, and a few tith Tzeentch and Nurlge. And you can use both, its only when your general has a god mark may you not use units of the other gods mark, but you can still use the other two gods units just fine (So if you have a lord with mark of slannesh, you may have a unit of tzeentch chosen AND a unit of Plauge Marines, but no zerkers.)
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