Flying Prowess (Whenever you cast a noncreature spell, this creature gets +1/+1 until end of turn.) When this creature enters, scry 2
III Destroy all creatures
If that player or planeswalker is an illegal target when Skullcrack tries to resolve, it won't resolve and none of its effects will happen
Trapjaw Tyrant 0.5 Not as dodgy as the vampire 1/1 for 4 but still rather in that camp
However, I'm hopeful we do not need to do this, as it would need to be a fairly extreme circumstance
Spider-Man 2099, Miguel OHara When Spider-Man 2099, Miguel O'Hara hits the field, it can bounce a creature to clear the way or reset your own ETB effects