Sinister Serpent & Dark Door

Hey, guys guess what.

i was looking through my cards one day and guess what i came upon. A nice 
combo that may save your life. You put out the card 'The Dark Door' and a 
'Sinister Serpent' and your opponent can only attack you once. Unless your 
opponent is playing with Hayabusa Knight or the IOC Black Luster when you 
can attack twice with.