Herman Carter, The Doctor

Overwhelming Presence —Activated abilities of creatures your opponents control cost {2} more to activate.

Carter's Spark —{1}{b}{r}, {t}: Put a madness counter on target creature an opponent controls
(max 3). That creature's controller may pay {3} during their main phase to remove a madness counter. (1 madness: -1/-0. 2 madness: goaded. 3 madness: loses all abilities and becomes tapped and cannot be untapped.)