Pack Rat is a rare Creature — Rat card from Secret Lair Drop (SLD), collector number 1448. Current market price: $13.26 (foil $14.54), TCGplayer market prices via Scryfall.
Pack Rat's power and toughness are each equal to the number of Rats you control. {2}{B}, Discard a card: Create a token that's a copy of this creature.