Pir, Imaginative Rascal is a rare Legendary Creature — Human card from Secret Lair Drop (SLD), collector number 1050. Current market price: $9.45 (foil $10.22), TCGplayer market prices via Scryfall.
Partner with Toothy, Imaginary Friend (When this creature enters, target player may put Toothy into their hand from their library, then shuffle.) If one or more counters would be put on a permanent your team controls, that many plus one of each of those kinds of counters are put on that permanent instead.