Use King of the Swamp depending on what you need. You can send it to the Graveyard to get Polymerization or use it as a Fusion Substitue. It's recommended to have more copies of this card and replace other Fusion Substitute monsters.
With Draw Sense, there's no need for extra Kidmodo's and the only cards Chazz has that can spell doom for your Blue-Eyes are Lightning Vortex and Megamorph, Lord of D. doesn't help against those and is too weak on its own to remain on the field.
The Dark Paladin deck is good, but it’s more useful if you can replace Dark Flare Knight with Buster Blader the Dragon Destroyer Swordsman. It’s stronger, and also gets the dragon boost that Dark Paladin gets, so you can potentially get Gravekeeper’s Vassal up to over 10000 attack with only one copy of Union Attack.
Chazz is perhaps one of the most challenging but his weakness are dragons. I use Buster blader dragon slayer. I suggest using blue eyes and substitute fusions. Try to put as many dragons in his grave as you can then summon buster blade fusion. I got over 10,500dmg with it. It's best to bait out lighting vortex before you fusion summon.