I did a very short testrun with this deck yesterday, altough i made a very small genral mulligan file which basicly was:
hold Bat or 2x with coin
hold toad, juggler, elekk or 2x with coin
hold animal companion
hold weapon if there is a 2 drop in hand aswell
Settings around 6000.
I ended with a 65% winrate in 30 games, went from rank 15 to 11.
Will write a full mulligan soon probably.