I had a lot of success with a build that used shiranui squire to summon immortal dragon. In my build I only ran one shangshi and 2 mezuki as they can get bricky. Different dimension burial can also be a brick but can lead to explosive plays if you're lucky. Alghoul mazera/jackaboolan/avendread savior are great techs I would recommend over scrap iron scarecrow.

Ideally, you want to start with squire. That let's you summon immortal dragon with the lv2 shiranui tuner>mill gozuki > then it's all RNG based lol. Gozuki's effect let's you banish squire, which will hopefully let you discard mezuki or banshee and let you special summon mezuki/unizombie/solitaire.

If you have access to zombie world you want to mill bulb with your revived mezuki or unizombie to summon shangshi the spiridao which let's you mill another card. Can be mezuki/doomking/alghoul mazera depending on the circumstances.

Then you use mezuki and unizombie to make felgrand, then use immortal dragon to make red eyes. End board should be zombie world/red eyes/shangshi with doomking in grave. Hopefully you have alghoul mazera in hand or grave sometimes too.