Unpassable Thorn-Field

Nonchaotic creatures can't attack.
Chaos 4 — At the beginning of your end
step, put a chaos counter on this permanent,
then, if it has 4 or more chaos couters on it,
sacifice it.
Order 3 — At the beginning of your
upkeep you may remove a chaos counter from
this permanent. If you do, you lose 3 life.