Is the Yubel skill absolutely necessary for this deck to work well? Also, since I only have one sphere kuriboh, would it still help to add in two regular kuribohs even though they won't protect my monsters? Or should I use something else?
Switcheroo or destiny draw is a ok choice and normal kuriboh is fine you just need to be extra careful of onslaught sense they will still make contact with your monster if not just drop them for 2 enemy controlers
I actually use Beatdown with this deck. A lot of the time, once Terror Incarnate is out, your opponent will just stall and not put any monsters out. Since you end up having only Terror out, you can't really do any damage. Beatdown allows you to kinda' poke at them, and it also allows Phoenix to hit a lot harder when it gets out, especially if you have both Phoenix and Terror out.
Cyber style is what im currently using till i get the skill. 2 kuribohs are fine i use them i dont have 3 sphere. most the time u want your monsters to be destroyed since theyll probably be fireking yaksha to destroy yubel or phoenix
instead of beatdown i just use some skystarray since they banish themselves after they attack directly. they will then come back after ur next standby phase