I'm not sure I understand the 2 Magical Merchant. You don't necessarily need to fill the grave for any of the cards that your using. Is it simply just to get the spell or trap to the hand?

I agree with angelic samurai about putting in a Chaos Sorcerer (and dropping 1 Thestalos). With one it will be a touch of nice control for ya. A couple of other suggestions would be:

-1x Magical Merchant
+1x Mobius the Frost Monarch

As I mentioned before, I don't see the need for the Merchants therefore I feel 1 is more than plenty for the build. and it could help the 1 Sorcerer if you choose to add. Also, you don't have much in the lines for stopping spell/trap cards. Heavy Storm, MST and Breaker are the extent of it so Mobius would help you there, and he's a monarch so he fits the theme/build.

-1x Sakuretsu
+1x Drop Off

This would help with some hand control and not hurt ya to bad with the monster killing ability. You still would have 2x Sak, TT, MF, 2x Smashing, 2x NoC. Not to mention the Book of Moon and Enemy Controller if needed to help with attack negation. This may also help a bit more with being able to use the Brain Controls more often.

Well, hope I have helped some or at least have given you something to think about. Good luck and have fun.

-1 Magical Merchant
+1 Magician of Faith

-2 Thestalos the Firestorm Monarch
+2 Mobius the Frost Monarch

Nice Deck
9.5/10

Here is a suggestion:

- Thestalos the Firestorm Monarch x2
- Night Assailant
+ Mobius the Frost Monarch
+ Chaos Sorcerer x2

That seems a little better. Return the favor? (If you already did, dont worry about it) Great job soul taker.

-Shane