Anivia, the Cryophoenix

Anivia, the Cryophoenix does not untap during
its controller's untap step.
{2}{w}{ut}: Create a 0/3 Ice Wall creature token with
Defender. Activate only as a sorcery.
{1}{u}{u}{t}: Put a stun counter on Anivia, the Cryophoenix. While Anivia, the Cryophoenix is tapped, creatures your opponents control don't
untap during their controller's untap step.