Taitva, Chronomage Apprentice

{u}{r}, {t}: Exile Taitva, Chronomage Apprentice.
Return it to the battlefield tapped at the
beginning of your next end step with a flux
counter on it.
{1}{u}{r}, {t}, Remove a flux counter from Taitva,
then sacrifice it: Take an extra turn after this
one. Activate only as a sorcery.