recurring nightmare is banned in edh so I would suggest killing wave to replace or lashwrithe in monoblack hes just fun.
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thats the one thing about edh you dont have to know any of the old cards to have a good deck but i would suggest taking out kakusho the evening star as he is not legal in edh. add a corrupt maybe remove mutilate and put in All Is Dust as it is the best wrath card in the format. i used to play mikaeus as my general and loved to sac rune scared demon with a mortor pod for a double demonic tutor. just some hints hope they help.
I like this deck due to its cost and the fact it seems fairlybalanced would trade red suns zenith out for lightning bolt (if tournament legal)