Instant, 1W (2)
Common
Creatures you control gain protection from non-Human creatures until end of turn.
"As long as we can utter a prayer or lift a weapon, we have the power to fight back."
—Thalia, Knight-Cathar
Illus. Jason Felix

9/22/2011: Only creatures you control when Spare from Evil resolves will be affected. Creatures that enter the battlefield or that you gain control of later in the turn won't be.
9/22/2011: A "non-Human creature" is any creature that doesn't have the creature type Human. A creature that is a Human in addition to other creature types is not a non-Human creature.
Legal in Vintage (Type 1)
Legal in Legacy (Type 1.5)
Legal in Extended (Type 1.X)
Legal in Standard (Type 2)
Legal in Classic (MTGO)
Legal in Commander
Legal in Modern