Cunning Sacrifice

As you cast Cunning Sacrifice, each player
chooses a creature they control, and exiles it.
Whenever a creature dies, that creature's
controller creates a token that is a copy of the
exiled creature they chose, it enters the
battlefield with a -1/-1 counter on it and is
detained. If the exiled creature is legendary,
the token copy is not legendary.
(Until your next turn, this permanent can't attack or
block and its activated abilities can't be activated.)