If I'm not mistaken your deck consists of 50 cards and it looks like a total mess to me :S
Dark Grepher and Armageddon Knight are used to send Stygian Street Patrol from the deck(or hand) to the Graveyard.
Reinforcement of the Army searches for both.
Allure of Darkness and Maxx "C" for draw power.
With Tourguide from the Underworld you can special summon Sangan who then searches for Yubel.
You can also use a Tourguides effect to summon another one for a Rank 3 XYZ summon. (And no, XYZ monster are not destroyed when they use up their attachments like someone stated otherwise before.)
When Stygian Street Patrol is in the Graveyard you can use its effect to special summon Yubel straight from your hand.
You can use Torrential Tribute to summon Yubels next form.
If you have atleast 2 normal Yubels in the Graveyard, you can then use the traps Limit Reverse and Call of the Haunted to special summon them and do a Rank 10 XYZ summon.
Just to name a few combos of this deck.
Montage Dragon is also considerable.
I hope this helps a bit^^