Is she actually good as a control commander?
I was thinking about changing my Derevi blink deck into a control deck, but it seems like the only good way to do that is to basically go full stax and I don't think my friends will find that all too fun to play against. (I also assume stax is fun to play one time and then not again)

So how about Y'shtola? It looks like you can kill opponents way faster than control/stax Derevi (where you'd just make everything miserable and then what?)

I'm broke too, so I can't really get any expensive/good cards for either deck.
I'd just like to hear some opinions if somebody has tried both commanders.