+1 that "unstuck" is exploitable. However giving you a free teleport home is also exploitable. Can it be engineered to not allow you to pass through barriers? Perhaps it might be enough to teleport you five meters straight up, not straight forward? It appears getting stuck in terrain usually involves getting your avatar trapped "under" terrain features.
In most other games where such solution is needed (pretty much any game that has no hearthstone equivalent), unstuck teleports the user to his home area or to some completely random spot that isn't hostile.