The build I'm currently playing focuses on Rank 6's, better know as Atumus the Hieroglyph Dragon Lord. Its ability to special summon Red-Eyes Darkness Metal Dragon from your deck is deadly.
If that doesn't work, I have a back up plan in the form of Dragorado, which basically fits itself into the deck easily. Since it tributes stuff and acts as Debris Dragon for normal monsters. In addition of being a Debris, you can have it be a level 8 by releasing a Dragon (aka any of the Hieroglyphs). Now you can have Emmet and another normal monster out.
The problem I have with the deck as of now is :
The deck leaves you empty handed most of the time after a combo. Most of the combo are easy to do but it will almost always take your entire hand to do it. Which would be a problem if your OTK doesn't work.
Conclusion : The deck is definitely fun and definitely has potential. A level 6 normal Hieroglyph Dragon can make this deck a lot better in my opinion. Which may actually be in the pack as well. If you look at Hieroglyph Seal's set number, its GAOV - JP002, normal monsters always have been the first few cards in the set, and now we have this card as a 002. 001 will be another normal monster, I really hope it'll be the dragon I'm waiting for.
If we have a Rank 4 Hieroglyph Dragon with a good effect, that'll probably broke this deck. Not possible in this set as all the monster exceeds have been shown.