I remember the last time there was a comic with iceman and thor and ymir (don't know if storm was there.
Anyway Ymir turned thor into a icecube and iceman... hmmm forgot what iceman did but he didn't fight ymir though. But ymir did "acknolwedge" iceman's powers. And something along the lines of someone saying iceman could potentially be the next Ymir.
Anyway Maybe Thor can BFR ymir maybe. other than that I don't think the team can win...