Stensia Masquerade is a uncommon Enchantment card from Shadows over Innistrad (SOI), collector number 184. Current market price: $0.24 (foil $3.39), TCGplayer market prices via Scryfall.
Attacking creatures you control have first strike. Whenever a Vampire you control deals combat damage to a player, put a +1/+1 counter on it. Madness {2}{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.)