Holy Marked Dragons

Hey there everyone, DN has added the Holy Marked Dragon archetype and I think they are really cool. I know they need more support but this is the deck I have so far. Any feedback is greatly appreciated. So please, post any suggestions or comments on this deck. Thank you very much
Here is the Decklist:
Monsters: 21
-Holy Marker of the Divine Dragons x3
-Alexandrite Dragon x3:-Blue-eyes White Dragon x3
-Geb, the Holy Marked Dragon x3
-Nephthys, the Holy Marked Dragon x2
-Shu, the Holy Marked Dragon x1
-Isis, the Holy Marked Dragon x1
-Tefnut, the Holy Marked Dragon x3
-Red-eyes darkness Metal Dragon x2
Spells: 11
-Holy Marker of Gathering x3
-Holy Marker of Supreme Force x2
-Book of Moon x1
-Dark Hole x1
-Heavy Storm x1
-Mystical Space Typhoon x3
Traps: 8
-Holy Marker of Obliteration x3
-Solemn Warning x2
-Dark Bribe x3
Extra Deck: 12
-Ennead, the Holy Marked Divine dragon x2
-Thunder End Dragon x2
-Atum, the Holy Marked Dragon Emperor x2
-Number 39 Utopia x2
-Steelswarm Roach x2
-Daigusto Emeral x2

Bah Holy Marked dont need much else, they have broken search card and broken swarm battle summon.

As for the deck I cant see much of it due to Forum size, but it looks solid. I just can't wait for Neo Galaxy-Eyes to come on DN and break these guys.

What is the focus of holy marked dragons?

Swarming based of tributing. Tributing Holy Dragons usually allows you to special a level 8 normal dragon from your deck, thus unlocking their Xyzs.

Basically what Hollowninja just said.