Shadow is a keyword ability on creatures that serves as both an evasion ability and a blocking restriction, featured in the Tempest block.  An attacking creature with shadow can only be blocked by a defending creature with shadow, and a defending creature with shadow can only block an attacking creature with shadow. It was first seen in the Tempest block, and was revisited in the Time Spiral block. Shadow is found on black, white and blue creatures, while a few red and green creatures are able to block shadow creatures. Aura Æther Web permits enchanted creature block creatures with shadow as though they didn't have shadow. Shadow made a minor appearance in Time Spiral.  It is unlikely to return again. 
- It is possible for Banding to result in a Shadow creature blocking or being blocked by a non-Shadow creature. This is legal.
 Color percentages
 Creature type
 Cards that grant Shadow
- Randy Buehler. (December 20, 2002.) "Out of the Shadows", Daily MTG, magicthegathering.com, Wizards of the Coast.
- Aaron Forsythe. (September 08, 2006.) "Overseer, Overboard. Bringing back the “forbidden” mechanic", Daily MTG, magicthegathering.com, Wizards of the Coast.
- Mark Rosewater. (November 21, 2012.) "Shadow on the stormscale", Blogatog, Tumblr.