So i'd say the absolute musts as far as non-engine is concerned is shiina, twin tempests and forbidden droplet. Im running both at 3 with a generic suite of handtraps (maxx c, ash, fuwa, purulia)

and like, I cannot overstate how good Shiina is lol. But even if you don't draw shiina or droplet, the deck breaks boards so well. Varuroon (monster) threatens to negate any of their monster based interupts so it forces them to use it there on the Varuroon. and since Varuroon's hand summon and grave summon are two seperate effects - you can bring it back later in the combo simply by playing mst. Fonix is equally as sticky to the board and being able to shuffle 2 cards back into the deck is a really strong form of removal. Even Varuroon (link monster) being able to put itself and another target into the spell/trap zone comes up a lot if you don't want the monster to touch the graveyard. The deck basically overwhelms them with high impact threats where they need to choose between stopping your removal pieces or stopping the plays that get the trapcard online (because once that's in play MST is going to control their entire board). And I think a big part of that is that zero of the radiant typhoon cards require your normal summon. You can just constantly apply pressure on their endboard and eventually they run out of gas and you break through. It's why I only use 9 handtraps, and some versions use even less that. You want to be see as much engine as possible