I always thought this should be a 4 mana card.
Spellbreaker is as good as Operative in most matches and better against Mech Paladin due to Kangor's Endless Army.
AND far better statted were you to play it as a vanilla minion. Oh, and more flexible too.
E.M.P. Operative is just a poor tech card which is vastly overshadowed by silence minions.
All of the above.