Nazgul Skyrider

Flying, haste, shroud
When Nazgul Skyrider enters the battlefield, tap
all other creatures and put a stun counter on
each. (If a card would become untapped, instead
remove a stun counter from it.)
If The One Ring is on the battlefield and
equipped to an opponent's creature, Nazgul
Horseman must attack that opponent each turn
if able.