Sengir, Lord Progenitor

Flying, protection from black and red.
{t}, Pay 2 life: create two 1/1 black vampire spawn creature tokens with lifelink.
{t}, Sacrifice two vampires: put a +2/+2 counter on Sengir, Lord Progenitor.
Vampire spells you cast cost {1} or one {b} less for each vampire you control.