And hey, here I am to help!
Magician of Black Chaos=bad.
If you want to do a Dark Magician deck, read this
. You can make a decent deck around Dark Magician. There are better spellcaster decks, but he's got support that makes him kinda playable. This deck is unfortunately going in too many different directions to work.
If you want to stick with a Ritual theme, there are better options for Ritual monsters. Some you can even use within the spellcaster realm. Read about them here
I'm sorry, but if your wasting so many resources on a ritual summon, you really want to get more out of it than a beatstick. THat's all Magician of Black Chaos is. On the other hand, something like Divine Grace - Northwemko has slightly less attack power, but has an awesome effect to protect herself. Herald of Perfection is run over by several commonly used level 4 monsters but it's effect can create a nearly unbreakable lockdown in the right deck. These are things you need to consider when building a deck around a card.
Also, Royal Decree is never a good idea. You're better off with a real trap lineup.