Sister of the Council

Exhilarate {2}{w}{u} (You may exile this card from
your hand or from the battlefield and pay its
exhilarate cost. If you do, create a token that's a copy
of it. At the beginning of the next end step, sacrifice all tokens created this way and then return this creature
from exile to the battlefield under its owner's control.)
Whenever Sister of the Council enters the battlefield, detain target permanent.