My bad, I meant Kokusho, the evening star, I misread that one. Check out my deck, lots of good harmony at least on face. I also recommend Purity and Vigor, you will be happy you did, they are incredible cards when both are out.
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I have a Mayael deck too. I think you have too many dragons that dont have enough focus for burn. Try the Scourge of Kher Ridges, he is just a good multipurpose nuke card and it would allow you to take the ancient hellkite, the hellkite charger, steel hellkite, and bogarden hellkite because Scourge of Kher ridges is a more efficient mana creature on the overall. I would also say you have too many creatures that don't help out the other ones enough. Also, most people don't play Yosei in EDH decks out of courtesy.