ultimate ability - take the spike from opponent and drop it in a random part of the map
(I know its braindead. Just putting out a thought)
it's only the signature ability, for example they get one sage heal or phoenix molly and you don't know whose ability it is most of the time
I think it's pretty balanced at 30 especially since you have to be kind of close. I can see making it 20 though, it'd have to be playtested quite a bit
2 uses per round is pretty normal for some signature abilities as well