Bloodmad Vampire is a common Creature — Vampire Berserker card from Shadows over Innistrad (SOI), collector number 146. Current market price: $0.07 (foil $0.48), TCGplayer market prices via Scryfall.
Whenever this creature deals combat damage to a player, put a +1/+1 counter on it. Madness {1}{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.)