I have Guardian Angel attached to a unit that now has 3 Might. It is attacking an enemy Nidalee Cat Form. In the combat damage step my 3 Might unit takes lethal damage and Nidalee Cat Form survives. In combat cleanup my unit would die but Guardian Angel replaces that death and recalls it to base. Does my opponent draw 1?
Yes. Nidalee wins combat. The FAQ on results of combat is meant to cover the case where there is "no result" if units are recalled during step 3d of combat cleanup.