There should be a reverse-liandrys item

When I say reversed, I don't mean literally EVERYTHING reversed, I mean having the passive reversed.
Liandrys Torments passive does 2-4% (based on whether they are CC'd or not) of the enemies current health per second for 3 seconds after using a damage ability on them.
The reverse of this would be to deal 2-4% (based on whether they are CC'd or not) of the enemies MISSING health per second for 3 seconds after using a damage ability on them.
Why do we need an item like this?
The Liandrys passive only really works for poking them and having some extra damage dealt.
With this burst-damage meta, if they're left at 100 health after you combo them, they will not take any damage from this and therefore the items passive is uselsss.
If they're left at 100 health after you combo them and it does MISSING HEALTH dmg, muahaha..
This would be broken?
AP items have gotten heavily nerfed recently. A lot of items have lost their key elements (
lost 25% of it's health and AP, and the slow is now significantly weaker).
With an item that actually works with your kit, then you would be able to have AP item passive remain relevant right now (as opposed to AD items making your auto attacks AoE and giving them bonus range).
(I was referring to
and
)
Anyway, I would love to see this item and hope it gets considered.
,
, and
. These champions don't build it for the % missing health damage, they build it because it synergizes well with their kit and can apply its passive multiple times.