Chronos, Titan of Time

Indestructible, Flying
{w}, {t}: Gain 2 life.
{2}{u}, {t}: Counter target instant or sorcery.
{4}{b}, {t}, Sacrifice a creature: Exile target
creature.
{2}{w}{w}{u}{u}{b}{b}, {t}, Sacrifice "Chronos, Titan
of Time": Take an extra turn after this one.