I really like that idea...though its probably
1. too much like gravity pull...and thats a gravity card
2. a bit too strong for light, as I see light as a rather defensive/healing element
i might be an idea to change the ability to:
choose a creature you own. that creature attacks a random enemies creature instead of attacking the player.
this way the ability becomes quite unique and is nerfed a bit, while still being useful (especially for light monos)