Leviatar, The Faithful One

Protection against vampires.
Leviatar, The Faithful One can't be countered.
At the beginning of your upkeep put a prayer counter on Leviatar, The Faithful One.
{w}: Put a prayer counter on Leviatar, The Faithful One.
{t}: Remove X prayer counters. Deals X damage to target vampire creature. You gain X life.
The Lord is my shepherd.