I remember this one I read where its total attack depended on the total number of points added up from the monsters used for the Synchro summon. That could do some damage, but as a last resort/end the duel after summon it, since it could easily destroyed next turn via card effect, I'm sure.
edit: I have a question. My crap duelist of a friend managed to beat me, and he usually bs's his opponents during duels. I probably know the answer already, but he flipped Nobleman Eater Bug, destroy 2 monsters blah blah blah. He only destroyed ONE, I told him it had to be two, but he tributed it and another monster for Blue-Eyes.
So, if I can get his ignorant ass to read this, does he HAVE to choose two monsters, or can he only choose to destroy one because its his cards effect?