Aether Web

Oracle Text

Flash (You may cast this spell any time you could cast an instant.)

Enchant creature

Enchanted creature gets +1/+1, has reach, and can block creatures with shadow as though they didn't have shadow. (Creatures with reach can block creatures with flying.)

Card Rulings

9/25/2006 The enchanted creature can block creatures with shadow and creatures without shadow.
9/25/2006 If the enchanted creature has shadow, it won’t be able to block any creatures (not even those with shadow).