Subterror Guru is the main guy you want which when flipped either by battle, during your main phase, by hidden city or even final battle, can search either fiendess the negate or nemesis archer which can return set monsters your opponent controls back to the deck or if destroyed set guru from your deck.
Guru can also set monsters your opponent controls along with itself and can be a quick effect if you control another subterror, which works great if your opponent is trying to combo and you set a key card.
Your kaiju's can also stop any negates your opponent has or instead you could use lava golem or ra sphere mode instead.
There can be only one is to stop decks that run one type and you dont need to worry about playing around it yourself since all monsters in your deck are different types unless you try to fusion summon starving venom while guru is on field, thats the only interaction that doesnt work under tcboo.
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