Yuumi, The Kitty

When Yuumi, The Kitty enters the battlefield
it attaches to a creature you control and gains
Hexproof until the creature is removed from the battlefield.
At the beginning of your end step Yuumi,
The Kitty gives +1/+1 counter to the attached
creature for every turn it has been attached.
"They aren't ready for the ferocious team of... US!"
—Yuumi, The Kitty