https://www.youtube.com/watch?v=07rmh6fzp7U
they have a patch where they reduced witch cost by 1, but since you're using +5 up buff it shouldnt be an issue. Will be rather tight though.
9+9+12 = 30 UP
10+10+15-5 = 30 UP
@shadowfae https://www.youtube.com/watch?v=McPC1x6IjWI
used belinda but not until after 1st wave was cleared. also with +5 UP