this.expansionSetCode = "AVR";
// At the beginning of your end step, you may exile target creature you control, then return that card to the battlefield under your control.
Ability ability = new BeginningOfYourEndStepTriggeredAbility(new ExileTargetForSourceEffect("Conjurer's Closet Exile"), true);
ability.addEffect(new ReturnToBattlefieldUnderYourControlTargetEffect());
ability.addTarget(new TargetControlledCreaturePermanent());
this.addAbility(ability);
}