All the cards listed above does affect and increase damage to the skill Stave Crasher, including Turtle General. Fallen Bishop Hibram Card works with the boost in MATK as well as the Demi-Human boost.
What Cirrus suggested before on post #6 of changing the effects of Pandaring Card would be a good idea, I would say around 40-50%. For the original topic suggestion, I would agree on changing the formula for only that specific skill to have MATK x 2.