PTG Slayer
Behold! The GOD of War!
Basically, Doomsday's MB air snatch is able to recreate the same scenario as Grundy's MB walking corpse move. Without the need for stance switch to get the timing down.This tech has the exact same Pros and Cons of Grundy's move as well.
Basically, if you can land a meter burned version of Air Snatch, you dash in immediately and neutral jump body splash. This ambiguously crosses up the opponent if the body splash timing is on point, and creates an opening for your next move. Check out the video! Hopes this help, and sorry if this tech has been known already.