Dragonicwari
Artistically angry
It don't work like this just like azumarill got more than base 100 attack power it *1.5 the speed after all the boosts which means with full speed=
jolly 252 EVs: 229*1.5= 343.3 which is higher than positive natured base 106 (liepard) but more importantly kadabra (cause we are talking about NU).
Sorry, I haven't done a speed calc in a while, but I didn't see that you were comparing to NU, so I don't know how good that is
It doesn't multiply their base stat, it multiplies their maximum stat, like Ilan said above. And you can Sword Dance on the first turn, activate your Toxic Orb, get your Speed Boost, then sweep. I'm not really sure what you're missing.
So you go in, swords dance up, possibly take a hit and then have a really limited amount of time to sweep due to toxic. I see someone protect stalling you easily. Also I doubt you will have to many chances with this strategy without wish support. It doesn't match my playstyle to well is all, but it might work great for you