In fact, if you hyper-zoom on Carl Critchlow's art of the Mirrodin card Leveler, you can actually see one of those three legends right in the art.
No, you'll have to zoom in more than that.
Give up? Keep zooming...
Note that the red goo seen through the leveler's dome (check the middle picture above) is the shredded organic material of creatures it has already leveled. Yow.