Quill, the Kitty

When Quill, the Kitty enters the battlefield create
Lil Quill, a legendary 2/2 green cat token with
unblockable.
When Quill, the Kitty enters the battlefield create
a box artifact token with, "Cats you control
have hexproof and indestructible."
Quill, the Kitty gets +2/+4
as long as you control a box.
"Oh frabjous day!"
-Quill