Kuoyan, the Resting City

{t}: Add {c}.
{4}, {t}: Put a +1/+1 counter on target creature you
control and tap it. That creature gains shroud until
the end of your next turn. It doesn't untap during
your next untap step.
{4}, {t}: Exile target creature you control until
Kuoyan, the Resting City leaves the battlefield.
You may pay {2}. If you do, sacrifice Kuoyan, the
Resting City.