Valadar, Lord of Blizzards

Flying
Whenever Valadar, Lord of Blizzards enters
the battlefield or attacks, tap each other
creature. They do not untap during their owners'
next untap step.
Players can't cast spells during combat, and
on the turn Valadar enters the battlefield.
Blizzards are always in his wake, making it
impossible to slay him or his nearby minions.