^Well,if we are assuming urahara is blitzing,why won't itachi blitz too,on a lighter note,i think so,if this is in character fight,none blitzes.
Cannot be killed is a wide definition,see,Yin is imagination and yang is reality,through a combination of both,the world is created,when a user uses Izanagi,he eliminates his Yang self,and separates his yin form(imagination,illusion) from it,then creates another Yang form and inhabits(combines) it with his Yin form,you are basically unkillable,during this duration,by anything whatsoever,except higher order reality warping.
About the Fight,Itachi can simply amaterasu himself and turn himself and everything around him into a deathtrap,Or just amaterasu spam all day and burn the world,he needn't worry cos he's edo.he'll be going for suicide moves.And izanagi will also work after death,as long as any of your Ying/yang form is existent,you can activate izanagi at the cost of one eye.