Wall-Pact of the Legions

Chaotic creatures can't attack.
Chaotic creaures entering the battlefield don't
cause abilities to trigger.
Chaos 2 — At the beginning of your end
step, put a chaos counter on this permanent,
then, if it has 2 or more chaos couters on it,
sacifice it.
"The wall was meant to fall, along with it's vows!"