Tefna, Timebender

At the beginning of your end step, if a historic permanent entered the battlefield under your control this turn, you may choose one permanent under your control with a counter on it and add another of a kind already there.
{3}{w}{w}, Sacrifice Tefna, Timebender: Exile target historic permanent you control. Return that card to the battlefield under your control at the beginning of the next end step.