Stack of Paperwork

If Stack of Paperwork leaves the battlefield once a combat damage object is on the stack, combat damage still uses the stack for this combat damage step.

If a creature leaves the battlefield, combat damage it deals is dealt by that creature as it last existed on the battlefield. Combat damage that would be dealt to it isn’t dealt.

If a creature that would be dealt combat damage stops being a creature, combat damage that would be dealt to it isn’t dealt. If a creature that would deal combat damage stops being a creature, it deals combat damage.