Gringorth, Knight of Osiris

Menace
Gringorth. Knight of Osiris gets a +2/+2 counter as long as you control an Osiris planeswalker, and a -1/-1 if you have an Osiris planeswalker in your graveyard.
{t}, tap another Vampire Ally to add {1} to your mana pool.
"We made an oath, now must follow it," - Knights of
Osiris