This mechanic cancels all your opponents modifications of your or your opponents Pillz. This mechanic prevents your opponent from decerasing your Pillz or increasing his own Pillz.
This ability is no Stop. Opp. Ability or Bonus. Your opponents dope or consume abilities will be only deactivated in the round, in which "Cancel Opp. Pillz Modif." is activated".
The first card with this ability was Crystalis from the Vortex clan.