@Kuroaitou
I know it's too close to Improved Mutation, I was just replying to dragonhuman.
Oops, my bad. ^^;; Sorry if I sounded mean towards your post.
...maybe you can have it as a 'passive' bonus? As in, you apply this to a creature, and every time it
damages (keyword) the other player, its stats are raised +1/+1?