Creepy Puppeteer is a rare Creature — Human Rogue card from Innistrad: Double Feature (DBL), collector number 418. Current market price: $0.22 (foil $0.49), TCGplayer market prices via Scryfall.
Haste Whenever this creature attacks, if you attacked with exactly one other creature this combat, you may have that creature's base power and toughness become 4/3 until end of turn.