Outrageous Robbery is a rare Instant card from Murders at Karlov Manor (MKM), collector number 402. Current market price: $1.06 (foil $1.65), TCGplayer market prices via Scryfall.
Target opponent exiles the top X cards of their library face down. You may look at and play those cards for as long as they remain exiled. If you cast a spell this way, you may spend mana as though it were mana of any type to cast it.