Harbinger of the Bloodfang

Flying, haste
Whenever Harbinger of the Bloodfang deals
damage to a player put a +1/+1 counter on it.
Remove X +1/+1 counters from Harbinger of
the Bloodfang: Put a creature from your hand
onto the battlefield with a mana value of X. Its
a vampire in addition to its other types. Sacrifice
it at the beginning of the next end step.