How about
Saruman, SoS (a follower, not a minion), maybe with
Men Will Fall for the overwhelm? The twilight shouldn't be prohibitive if you're only playing 1 minion.
Also, while it's probably more trouble then it's worth, you could use
Throne of Isengard so that if the Witch-king is killed while bearing Saruman, he becomes
fierce when you play Saruman back.