Urge to Feed is a uncommon Instant card from Worldwake (WWK), collector number 70. Current market price: $0.23 (foil $3.04), TCGplayer market prices via Scryfall.
Target creature gets -3/-3 until end of turn. You may tap any number of untapped Vampire creatures you control. If you do, put a +1/+1 counter on each of those Vampires.