Instant, 2U (3)
Common
Creatures your opponents control get -4/-0 until end of turn.
"The panic is amusing, but the real fun comes when the spell passes and the villagers start looking for a scapegoat."
—Ludevic, necro-alchemist
Illus. Wayne England

9/22/2011: Only creatures controlled by your opponent when Hysterical Blindness resolves will get -4/-0. Creatures that enter the battlefield or that an opponent gains control of later in the turn will be unaffected.
9/22/2011: Hysterical Blindness's effect will continue to apply to a creature even if you (or a teammate) gains control of that creature later in the turn.
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