Evelynn, Agony's Embrace

When Evelynn enters the battlefield, target
opponent can't attack until your next turn.
{t}{b} Evelynn gets -1/-0. Target creature gets
-4/-2 until end of turn. If it were to die this way,
exile it instead.
If three creatures died or were exiled this turn, sacrifice Evelynn and return her to the battlefield transformed under your control.