Q/MQ remains the same
E/ME remain the same
W/MW can now be used on an ally champion
W used on ally causes the next attack or spell used on the target to instead effect karma (this can kill her), this will break the tether
MW teather does not break after the initial effect, but keeps its duration and causes 10/12/14/16(based on mantra lvl up) (+.15ap) of the damage taken by the target to be redirected to karma instead (this can kill her)
This lets karma trade the damage, root, and self heal of W/MW to strengthen her allies survival and give a 1 spell redirect if used with good timing (redirecting Taric stuns can win. A trade in bot lane) basically she gives her ally a spell shield at the cost of herself taking the hit, and it requires timing to get right and has counter play due to it only being 1 spell, this would make karma a valuable support in being able to shield and spell shield, have a root, some damage, and a speed boost
Making her a cross between lulu and Morgan's support strength while having to chose offensive support or defensive support for W and at times E for the engage or disengage value
This would put her in a healthy position for 2 facts, one the damage redirect is low enough that it will be helpful but not op in early game
Two , to make it effective she has to build a lot of AP which means she could end up killing herself because she is now missing in survival stats
While as tankma this will be useful with low risk of death from it but not overly so because you lack the AP to make it strong
Basically it lets karma chose a huge helping of her ally with high self risk or a lower helping with lower self risk, or a balance between the two, and then needing CD-R for mantra CD effects how often she can do it
Just my idea of how to do it
And making her a cross between lulu and Morgan's isn't a bad thing because both are strong supports, and this change would give karma her identity back at the same time of keeping a balance in offensive and defensive decisions