what are you two talking...
btw.. i'm understand this card effect it's very normal. you can use target creature skill by 4/3 right?
and about dive skill. it's x(x= creature atk)*2 and if you use this spell on it it will be x*2*2 and if you can keep it 6 card in one round it will be x*2*(2*2*2*2*2*2) = x*128? ....or i'm wrong with it?
Yeah, you got it right. It just has to be YOUR creature. As for Dive, we're treating it different. Basically, you got it right in your second post: x as attack and Dive is +x.
So you gain the skill of the targeted creature, but which creature will have this effect?
You don't gain the skill. The creature's skill becomes your spell, which you then use. And no, if you cancel, you get normal Speed Boost back, not a Paradox in card form.