Well chameleons change their colors, so at first I was thinking that it would be an element changing card, but then i realized that it would be a useless skill.
Then I was thinking that it should change target's element. Not the card element, but the element of the ability, rather.
So after I noticed the problem that chameleons couldn't possibly make other creatures change color, I made them chameleon orcs, which are entirely new creatures created by me, so I can give any kind of magic, color-changing power to them.