While firefist striker typically only lasts 1 combat phase, that's because it's a powerful card. I think I'd play pyreheart wolf over shortcutter almost all the time
Burning earth costs a hell of a lot for an 18 land deck. It's probably good if you ever cast it against UWx, but I doubt you want to board more than 1 or 2.
Goblin shortcutter is worse than the other similar effects we have available.