Instant, 1W (2)
Common
Cast Curtain of Light only during combat after blockers are declared.
Target unblocked attacking creature becomes blocked. (This spell works on unblockable creatures.)
Draw a card.
"Paint gold upon the wind,
Shape the wind into a shield,
And vanish behind the brightness."
—Snow-Fur, kitsune poet
Illus. Chippy

6/1/2005: An attacking unblocked creature exists from the time the defending player chooses not to block that creature until the combat phase ends. Curtain of Light doesn't have any legal targets outside of the combat phase.
6/1/2005: Curtain of Light does trigger bushido abilities.
6/1/2005: Curtain of Light isn't particularly effective against creatures with trample. Since the creature with trample has no blocker to assign damage to, all the damage will be assigned to the defending player.
Legal in Vintage (Type 1)
Legal in Legacy (Type 1.5)
Legal in Classic (MTGO)
Legal in Commander
Legal in Modern