Gravity Beast Des-Gardius

Flying
When Gravity Beast Des-Gardius enters the battlefield, destroy all other creatures with flying.
{g/u}: If {g} was spent to activate this ability, target creature loses flying until end of turn. If {u} was
spent to activate this ability, target creature gains flying until end of turn. You may activate this
ability if Gravity Beast Des-Gardius is in the
command zone.