"Sound of Star Evil Isolde Please give me your opinion" Deck 2015

Playing

This is his Deck using 《Isolde, Belle of the Underworld》and 《Tristan, Knight of the Underworld》included in the Premium Pack currently on sale.
When I saw Isolde's illustration, I thought, "Oh, let's build a Deck based on this one," and made it.
Isolde has the effect of changing the level of 2 undead on your field. So, as a result of thinking, "Is it possible to easily prepare an undead tribe while leaving the normal summon right?"
The basic flow is to recruit Piano with Geetas → Isolde as his Normal Summon → Xyz Summon by changing Piano to Undead. Synchro summoning using Symphonic Warrior is possible even without Isolde.
《Jewels of the Valiant》, which was mentioned in everyone’s comments, goes well with 《Mezuki》. Using the effect of 《Mezuki》to drop Isolde, using Tristan to retrieve it, and using the effect of Symphonic Warrior to drop Bato Oni, it is now possible to make flexible moves, expanding the range of strategies.
GY: Depending on the contents of your hand, it is possible to do 8000 damage in one turn.
Ex.) 《Uni-Zombie》(《Goblin Zombie》) for GY, Bato Oni, Sizas, Drums or Piano
　　Tristan and Isolde in hand (can be in GY)
　　Gitas installed in the P zone
①Gitas effect activated. Cut Isolde and recruit Sizas.
② Tristan Normal Summon and Isolde recovery, then Isolde Special Summon.
③ Drums or piano effect is activated. Remove from GY and change the attribute or race of Sizas (it doesn't matter which one you change at this time).
④ Activate GY's Sizas effect. Remove Sizas from GY and bring back his Symphonic Warrior that was removed earlier.
⑤ Synchro with 2 Symphonic Warriors, S summon Geyser or Notung.
⑥ Activate the Bato Oni effect from GY. Revive the DARK Undead.
⑦ Activate the Isolde effect. Reanimate undead and yourself to level 8.
⑧ Summon Xyz and Furanken with Isolde and Undead.
With this, a one-turn kill is established at 4500 + 2600 (2400) + 2100 = 9200 (9000). In the middle stage, Uni-Zombie and Geetas should have fertilized his GY to some extent, so it's a good target.

Strength

Since it uses Synchro and Xyz, it can respond flexibly to various situations. Dharma took out his Symphonic Warrior and included it as he could aim for more synchro by returning from Burn with Sizas effect.
Also, thanks to the involvement of Symphonic Warrior, I think that his Deck is quite interesting, as he uses up his Deck, hand, GY, and exclusion zone.

Weakness

After all, the Special Summon meta is tight. Also, his GY dependency is fairly high, so Macro and Dark Row are also painful. There are also disadvantages of Isolde and 《Uni-Zombie》.

Customize

I think there are a lot of things to stick into. So if you have any advice, please let me know.