Shuwen of Roaring Footfalls

Flying, hexproof from mana value 8 or less
When Shuwen of Roaring Footfalls enters the
battlefield, if at least thirteen mana was spent
to cast it, you get an emblem with "Creatures
you control with mana value 9 or greater get
+4/+4" and "Activated abilities of creatures
with mana value 8 or less can't be activated."