Rate/Fix My Yugioh Blackwing Deck?

instead of sangan i would put in a blackwing zyphrous the elite (not sure on spelling) because he is easy to bring back for sync and gives you grave control for DAD. cards for black feathers can go either way but what i have found is late in the game it is a dead draw so you probably only want one. D prison is a great idea but your right it is a lot so unfortunately the best way to get it is the structure deck. Also another card i found very helpful to replace the cards for black feathers is pot of avirus (not sure of spelling) it gives you five monsters back and you draw two cards