Irreplaceable Keeper

Vigilance, Scry
{t}{w} The Priest's Protection: Target human gains
protection from Magistrates until end of turn.
{1}{p/u} The Spymaster's Foresight: Up to two target
creatures gain Shadow until end of turn.
{x}{p/b} The Magister's Power: Up to X target
creatures gain -1/+2 until end of turn.
The Keeper's Burden: Sacrifice this creature to
prevent all damage that would be dealt to target
creature.