why not remove some cards for 2 or 3 megrim and at least 2 Final punishment, it will quicken the end of duel. while you at it add some hymm to Tourach that cost 2 black mana and force your opponent to discard 2 cards, but also put in total of 4 dark ritual it's best to have it. you can check my deck "Decaying Death"
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actually this deck can only be legal in Vintage format or tournament or so so it's should be ok
is there something i miss or overlooked of? is any card in the deck list is ban or restricted other than flash and ystical tutor?
but it is in the format cos the flash and mystical tutor are only permitted to be one each in the deck though i read the format in vintage, legacy and standard. it only illegal if you have 4 of flashes or mystical tutor.