@Meddler: What do you think of this ultimate for a support Champion?

Once again, excerpted from my Dancer Champion Concept.

Freesia dashes to target enemy Champion (550 range) and steals 20/25/30% (+1% per 50 AP) of the target's attack damage and ability power for 6 seconds. Freesia can then recast this ability within 3 seconds to dash to target allied Champion (cannot target self) and transfer the stats she stole to her target, increasing their stats for 6 seconds. If Freesia does not transfer the stats within 3 seconds, they are lost.

All stat modifiers decay over their respective duration. The stats given to your ally are equal to the amounts you initially stole.

Dash in, jack a bunch of the enemy's offensive stats, and then try to get back to your teammate to give them a huge steroid. The catch? You can get caught before making the return, so you have to play it smart! Oh, and the ultimate does no damage on its own, so you can't use it to assassinate someone directly.

For instance, say you wanted to steal AD from . If you ult to him, he could use his ult to tentacle you and then kill you. But if you wait for him to ult first (or make him MISS), he's an easy steal. Or say the enemy has an out-of-control with a . You could try to steal from her, but be careful not to do so while her E is available to her, or she'll kill you with a 2-second stun.

Would this be an awesome ultimate to have, or would it break some design rules that I'm not thinking of?