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While Sanity Grinding can be a fun card, for a blue/black deck it can be unstable. Throw them out, put 2 more Archive traps and another memory Erosion. Or more Jace's for draw ratio.
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the reason why i have Sanity Grinding is the ratio of blue mana symbols to black mana symbols 64:17. I would put another Memory Erosion but i allready have 4 unless there was a rule change i am unaware of.
I agree with the removal of Sanity Grinding. It's a great card in a mono-blue deck but its not as effective in a black/blue deck. I think you should consider adding another Archive Trap and possibly a Haunting Echoes. Circu-Dimir Lobotomist works really well in a black/blue deck because both of his triggered abilities trigger when you play a blue/black spell. I don't know how well the Roil Elementals work for you but i would consider adding another Nemesis of Reason. The other thing that has worked well for me is adding nonbasic lands like Watery Grave, Underground Sea, Underground River, Sunken Ruins and even fetchlands so your not waiting for that one single island or swamp. I personally haven't benefited much from Planeswalkers in a deck like this but then again you might like them. I would look into some of the suggestions/cards and hopefully it will help make your deck better for you
as i said above the ratio to blue mana to black mana is 64:17 thats the reason for the Sanity Grinding. the reason i have the roil elementals is used with the dimir aqueduct so i will always return one of them to my hand so i have land to play every turn and ill get 1 or 2 creatures. for the land undergrond sea cost a lot of cash to get a hold of one. the sunken ruins i like. and by fetchlands do you mean mana acceleration cards? oh and the underground river i dont really like that it hurts you to use black or blue. watery grave is decent. and the planeswalkers i was thinking of getting rid of them and added something else any suggestions