Sengir, Baron of Ulgrotha

Flying
Whenever Sengir, Baron of Ulgrotha deals
damage to a creature, that creature becomes a
Vampire in addition to it's other types. Then,
put a +1/+1 counter on Sengir, Baron of
Ulgrotha.
{t}, Remove a +1/+1 counter from Sengir, Baron
of Ulgrotha: Gain control of target Vampire.