Disclaimer: I will not focus on Art or grammar, unless the latter would make the deck too difficult to understand.
Alright, starting off the series of comments on all the submissions here on this one.
Back-Breaker Masaru's a bit of an interesting case to look over. I honestly approve of the idea of the big bruiser of a scary group being actually quite gentle and trying to look for the others. In that regard, the themes of the deck are quite fun.
On the flipside, I have to say, I have some reservations about the gimmick itself? This mostly owing to the possibility of it becoming really, really frustrating to play against if she doesn't give up the game when going through both of her Plans to Win. This is not necessarily the same as being difficult, but rather the inherent danger of grindy encounters starting to feel chore-y. Being paired with a more aggressive and reckless partner does probably curb this in practice, though, and I do like the mechanics of a paired duel with one hyper-aggressive player and one 'healer'. So in that regard, the deck is more interesting in that paired duel context.
Incidentally, I am not entirely sure what the Simple Card based on gimmick would be here, since she already has +1 Life gain there?
Still, good job!