A couple suggestions for Morgana's upcoming rework (Support oriented)

Drawing inspiration from arcDapineApple I came up with a suggestion for Morgana's upcoming rework.

The aforementioned player suggested an "Anti-Aid" mechanic, which would prevent the target from receiving any help from their allies, such as healing, shielding, picking up Thresh's lantern, etc. That in itself would be too powerful, especially attached to Morgana's current W. What I suggest is slightly different:

SOUL SIPHON (P): REMOVED: No longer heals Morgana for a % of damage dealt to enemy champions, cannon minions and large monsters NEW EFFECT: Enemy champions affected by Morgana's damaging abilities are applied the Soul Siphon debuff for 1/2/3/4 seconds (at levels 1/6/11/16). Morgana steals 5/10/15/20 + (1 per 50 AP)% of affected enemies' ally and self-healing and shielding. Debuff effectiveness is reduced by 20% for every champion affected beyond the first.

BLACK SHIELD (E): NEW EFFECT: While the shield holds Soul Siphon's effects are redirected to the shielded ally. If self-cast it halves Soul Siphon's reduction in effectiveness per affected enemy champion instead.

SOUL SHACKLES (R): NEW EFFECT: Enemies affected by Soul Shackles are marked as Cursed for its duration. Cursed enemies are unable to receive any help from their allies, but are also immune to Soul Siphon's effects. When stunned by Soul Shackles they're no longer Cursed, but remain immune to Soul Siphon for the next 2 seconds.

For such changes to be implemented I'm sure Morgana's damage output would have to be gutted, however.