It should work fine. Just make sure you are using your monster, summoning a level 7, and that there are no restrictions placed on summoning. I haven't had any trouble with this, but then, I haven't used it in a while.
if u use tribute doll at the beginning turn you cant attack.also a lvl 7 tribute has high defence if you know how to play.2nd turn drops a 1700 att for example
and you have 2300 defence it is a no brainer.