Ghostly Pilferer is a rare Creature — Spirit Rogue card from Core Set 2021 (M21), collector number 350. Current market price: $5.47 (foil $10.60), TCGplayer market prices via Scryfall.
Whenever this creature becomes untapped, you may pay {2}. If you do, draw a card. Whenever an opponent casts a spell from anywhere other than their hand, draw a card. Discard a card: This creature can't be blocked this turn.