Sindragosa is actually a little tricky to figure out – until you know a trick or two as revealed in this video.
There are some cool OTK decks like silence priest and spell damage burn decks, but if you want to complete this level on a budget all you need is this budget Priest list.
Decklist to Beat Sindragosa
Video: How to Beat Sindragosa
Here are guides to the other bosses in The Upper Reaches:
How to Beat Blood-Queen Lana’thel