Bloodtide Pariah

Unblockable
Bloodtide Pahriah can not block. Bloodtide Pahriah can not attack unless you control no other vampires.
Sacrifice a vampire: Bloodtide Pahriah gains +1/+1 until end of turn
At the beginning of your end step: Target creature you control other than Bloodtide Pahriah becomes a vampire in addition to its other types