Toothy Imaginary Friend

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