Instant, BB (2)
Uncommon
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.
Illus. Johann Bodin

3/1/2010: You don't choose which untapped Vampire creatures you control to tap (if any) until Urge to Feed resolves.
3/1/2010: If you cast Urge to Feed targeting an untapped Vampire creature you control with toughness 3, its toughness will be reduced to 0 by the -3/-3 effect. However, state-based actions aren't checked until the spell has finished resolving. You may then tap that Vampire and put a +1/+1 counter on it, raising its toughness to 1. It will remain on the battlefield.
3/1/2010: If the targeted creature is an illegal target by the time Urge to Feed resolves, the entire spell is countered. You can't tap any Vampires.
Legal in Vintage (Type 1)
Legal in Legacy (Type 1.5)
Legal in Extended (Type 1.X)
Legal in Classic (MTGO)
Legal in Commander
Legal in Modern