Wall of Vapor

Creature — Wall

Defender (This creature can't attack.) Prevent all damage that would be dealt to this creature by creatures it's blocking.

"Walls of a castle are made out of stone,/ Walls of a house out of bricks or of wood./ My walls are made out of magic alone,/ Stronger than any that ever have stood." —Chrysoberyl Earthsdaughter, *Incantations*