I'd remove the attacking set. If I'm using this in UU, its for Spikes. Also like pif said, scrap talking about a secondary Spiker, you definitely don't wanna waste two slots on that...
You also need to talk more about why you would use this over Froslass (Speed so you can't get Taunted + Final Gambit, mostly). You also definitely want Final Gambit here for reasons stated above, and probably enough HP investment to kill a certain threat--I'm not sure which one yet, so I'll get back at you on that. Ability should not get a tag, btw.