Number Crunch is a common Instant card from Unhinged (UNH), collector number 42. Current market price: $0.17 (foil $1.25), TCGplayer market prices via Scryfall.
Return target permanent to its owner's hand. Gotcha — If an opponent says a number, you may say "Gotcha!" When you do, return this card from your graveyard to your hand.