2019-10-04 : If the opponent dealt damage controls no planeswalkers, Questing Beast's last ability simply does nothing.

2019-10-04 : Once a creature with power 3 or greater has blocked this creature, changing the power of the blocking creature won't cause this creature to become unblocked.

2019-10-04 : Questing Beast only stops combat damage from being prevented by effects that specifically use the word “prevent.”

2019-10-04 : The damage Questing Beast deals to the target planeswalker as its last ability resolves isn't combat damage.