I don't dabble in "Other" cards and no element seemed to fit this card much at all, so I choose light since it seemed the best. The element choice didn't matter too much, since the cost for the ability and casting cost is Any. Chakra just makes me think of divine things, and what better to represent divine than light? That's how my thought process sort of worked on that. And the Wheel of Light is just a name in this case, it's basically how the Chakras are seen, usually as a wheel of light or circles of petals. So I was just using that name to describe the card Chakra generates.