@Meddler: I need to ask you about a "Curse" effect I thought of

This is all just brainstorm prototyping at the moment, so take it with a grain of salt.

I've been looking into making a melee fighter Champion whose damage and defensive capabilities increase as she gets lower on health, and who can force opponents into duels and make them essentially kill themselves fighting her. She differs from Rammus, Shen and Galio in that she's an AD-scaling Champion, not AR-scaling, and is less durable than they are in exchange for more firepower.

One of her skills, however, is one that I'm concerned might break some Gameplay Design rules. Here is a rough description:

Demacian Retribution Fire a skillshot that deals moderate physical damage to the first enemy it hits and Curses it for 3 seconds. Whenever a Cursed enemy performs a basic attack, it takes a small amount of physical damage (this damage cannot kill, but will reduce the Cursed victim to 1 health if it would otherwise be lethal). Additionally, you gain bonus movement speed when moving toward a Cursed enemy Champion.

I worry that this breaks the "Burden of Knowledge" rule, but given how some newer Champions (i.e. Rek'Sai) have borderline broken that rule (i.e. crushing a Rek'Sai tunnel will not stop her ultimate if she is already channeling on that tunnel), I have to ask whether or not a skill like this would be excusable.