I voted for Hyra's =D
Mainly because it's the fastest. It outspeeds standard mixape with a neutral nature, although I myself would run +Speed to beat out Gengar, Starmie, Ambipom, Azelf, Sceptile, Alakazam, and, most importantly, Dugtrio. Sure, MWL's can also do that, but I like that Hyra's is more physically oriented (its Megahorns hit just as hard as Heracross') to take down Blissey more easily. MWL's requires max attack and a boosting nature to 2HKO a Blissey with only 104 HP EVs (and most, if I'm not mistaken, carry more than that if not max these days). Hyra's can reach that with fewer EVs, or go for more to guarantee the 2HKO on Blisseys with more HP EVs. Taking down Blissey is extremely important for this guy, as he can easily sweep with BlizzBolt and all that speed (Now, I know his Sp. Atk. isn't spectacular at 105, but that's still damn powerful considering he's packing STAB Blizzard.)
Also, if he gets Compoundeyes, Megahorn becomes 100% accurate, while 70% accurate moves like Blizzard and Thunder (!!!) become 91% accurate. Could you imagine how powerful that would be? Dual 120 STABs (100 and 91 accuracy to boot) alongside 91 accurate Thunder! He'd be a fucking wrecking ball!!! WRECK. ING. BALL. Seriously, MAKE COMPOUNDEYES AN ABILITY CHOICE WHEN THAT POLL COMES AROUND!
There, I'm done. =]