Mage. It's not a word you come across too often, though its roots are obviously entwined with those of "magus"--as in the three magi, the wise men who followed the star from the east-and indeed "magician." It denotes one of deep learning, sometimes to an occult degree. And if the horse bearing that name (a son of Good Magic, it hardly needs adding) should happen to win the GI Kentucky Derby, then perhaps we should view the man responsible for bringing him into the world as aptly honored. Because just...