I quit Magic a while back, so I'm not terribly familiar with any card from Return to Ravnica or after.
However, I can still see a few things. Pull the Angelic Wall, and put in either the third Accursed Spirit or the Wring of Flesh. Maybe one of the Minotaurs, depending on CMC (I'm leaning towards the Spirit off of a wild hunch). Walls usually don't help you win a game, and if you are winning, don't help you to stay that way. The best you can hope for is a few turns of stalling, and that can be better handled by having another creature (so you hopefully won't need to stall) or removal (to get rid of the creature your Wall is blocking). Unless you're running a Wall theme deck - which can be done, and I have such a deck posted somewhere around here.
Don't use the Mind Rots, mostly because you don't have a strong discard component that I can see. Mind Rots aren't useful outside of discard based decks in my experience.
Your removal doesn't look too bad, considering your mana base. If possible, I'd try to get one or two more white removal spells to handle the black creatures that might come your way. To fit them in, cut some of the one of spells. Dark Favor and Mark of the Vampire are the likely suspects to me; if one of them buffs your creatures, drop that one. If both do, drop the one with the highest CMC.