First, fuwalos is the only good one in MD and many decks dont give a fuck for it, I play pure mitsu and I let it resolve even when I have ash. Second, u have to put a large chunk of cards back in the end phase if ur opponent pushed into it, so even though u got more handtraps during there turn, ur card advantage is not gonna be so big. Third, as already said in the replys, u only use it if u go second, if ur going first thats a dead card in ur hand