The Veil

At the beginning of your end step, you may exile target creature you control, then return that card to the battlefield under your control.
"He had the strangest feeling that there was someone standing right behind the veil on the other side of the archway. Gripping his wand very tightly, he edged around the dais, but there was nobody there; all that could be seen was the other side of the tattered black veil."-Harry Potter