CardName: Witclock Physician
Cost: 2W
Type: Creature - Human Cleric
Pow/Tgh: 2/2
Rules Text: Whenever an activated ability of a creature resolves, if
this is the second time that ability has resolved this turn,
exile that creature for as long as Witlock Physician remains
on the battlefield. (That creature returns under its owner’s
control.)
Flavour Text: "Mania is a disease which requires treatment, just as any
other."
Set/Rarity: My Future Sight Uncommon
Witclock Physician
U
Creature – Human Cleric
Whenever an activated ability of a creature resolves, if this is the second time that ability has resolved this turn, exile that creature for as long as Witlock Physician remains on the battlefield. (That creature returns under its owner’s control.)
"Mania is a disease which requires treatment, just as any other."
That's unique. I'm pretty certain mentioning "resolving" an ability gives this some bonus complexity points.
I could see this as a rare hate bear. Maybe uncommon is fine, too. Without e. g. flash I don't think this needs to cost three mana.