Lavaz, Oathspeaker

At the beginning of your upkeep, add a oath
counter to target creature you control.
Creatures you control with Oath counters on
them are Vampires in addition to their other
types for as long as Lavaz, Oathspeaker is on the
battlefield.
Vampires you control have +X/+X, where X is
the amount of Oath counters put on creatures
minus 3.