Mindless Slaves

All the following creature types in play gain
-2/-0 while mindless slaves is in play: artifact,
demon, devil, goblin, golem, ogre, illusion,
insect, orc, ooze, sliver, skeleton, specter,
spirit, thrull, troll, wall, worm, wurm, zombie.
"No mind, no soul. I will show you how slow
and useless your minions are if they cannot
think for themselves."