Toothy, Imaginary Friend

Partner with Pir, Imaginative Rascal (When this creature enters the battlefield, target player may put
Pir into their hand from their library, then shuffle)
Whenever you draw a card put a +1/+1 counter on Toothy, Imaginary Friend.
When Toothy leaves the battlefield, draw a card for
each +1/+1 counter on it.