This deck aims to go first, any hand that starts with a way to get subterror guru´s flip effect for a subterror fiendess is decent, but what we really want is to get the "god board" The god board is in your opening hand see pre-preperation of rites, a high level monster, world legacy monstrocity and the hidden city. First use the hidden city for subterror guru, then use pre-prep for tarotrei and prediction ritual, activate prediction ritual sending the high level monster to summon tarotrei. use world legacy monstrocity to summon pot of the forbidden and deus-x-krawler from deck,
next because they both get destroyed anyways during the end phase link them away for a subterror behemoth fiendess. use fiendess effect to send a flip from the deck to the GY mostly umastryx then set either a high level flip monster you may have drawn in the zone she points to or set guru by her effect. Next use the hidden city to flip Guru face up, searching a subterror fiendess. Subterror behemoth fiendess other effect activates and you get to add a flip from GY or deck to hand, search ultramafaus or umastryx. Now you can normal summon subterror fiendess, activate her effect setting the Guru to special summon umastryx from GY in face up def position.
Now go to end phase and tarotrei activates her effect to set a flip from the gy or the hand, set Deus-x-krawler from the GY and during the oponents standby phase use tarotrei to flip Deus-X-krawler to face up atack mode, this makes deus-x live and your oponent can no longer use monster effects on their side of the field.
This is the absolute best opening you can hope for, you have a permanent skill drain from deus-x for your oponent, you have the omni negate from subterror fiendess in case they have spell/trap removal such as lightning storm or evenly matched and battle protection from the hidden city and your now set umastryx that banishes a monster when flipped by hidden city.
It is a really fun deck that I have been working on for almost 2 years and have played pretty sucesfully at locals and online. Build it if you want and thanks for reading this.