Grand Arbiter DCLXVI

Your opponents can't cast spells from anywhere
other than their hands, can't cast spells on your
turn, and can't cast more than one spell each turn.
Permanents your opponents control enter the battlefield tapped.
When a permanent an opponent controls
becomes tapped, put a stun counter on it.
Activated abilities of permanents your opponents control that aren't mana abilities can't be
activated, and triggered abilities of permanents
your opponents control don't trigger.