Felonious Rage is a common Instant card from Murders at Karlov Manor (MKM), collector number 125. Current market price: $0.22 (foil $0.19), TCGplayer market prices via Scryfall.
Target creature you control gets +2/+0 and gains haste until end of turn. When that creature dies this turn, create a 2/2 white and blue Detective creature token.