Toothy, Imaginary Friend is a rare Legendary Creature — Illusion card from Battlebond (BBD), collector number 12. Current market price: $11.83 (foil $11.43), TCGplayer market prices via Scryfall.
Partner with Pir, Imaginative Rascal (When this creature enters, 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. When Toothy leaves the battlefield, draw a card for each +1/+1 counter on it.