Distemper of the Blood is a common Sorcery card from Eldritch Moon (EMN), collector number 126. Current market price: $0.07 (foil $0.29), TCGplayer market prices via Scryfall.
Target creature gets +2/+2 and gains trample until end of turn. Madness {R} (If you discard this card, discard it into exile. When you do, cast it for its madness cost or put it into your graveyard.)