The Winding Walls of Qel

Walls you control have Vigilance and are
Snakes in addition to their other types.
When The Winding Walls of Qel attacks a
player or planeswalker you may have any number
of Walls you control attack the same target
as if they did not have defender.
During each of your combat steps each Wall
you control assigns combat damage equal to
its toughness rather than its power.