Shen's W NEEDS a passive. Maybe something healing releated?

Shen is getting quite a bit of talk lately with his new update. Some good, others...not so much. One thing I have seen is that his W is quite...lackluster and I can agree with that.

As of right now it only an active that blocks auto attacks when inside is VERY short time of 1.75 seconds. It needs something else and I believe it should have something that Shen players are pretty much missing too: Healing. So here was my thought on a passive.

Passive: When Shen or allies kills units near the spirit blade , it gathers it life essence. When the spirit blade is called to Shen (By Q or R) Shen is healed by the amount it has stored over 5 seconds.

Active: Active: Shen's spirit blade creates a defensive zone for 1.75 seconds, blocking all basic attacks that would hit Shen or an allied champion while they are inside and heals allies for half of the amount stored over 5 seconds.

Cannot collect life essence when on cooldown and life essence is lost on death.

This can be interesting because you would have to keep the sword out in the open to collect the essence (so no sneaky plays) and you have to make the killing blow (or an ally) to get the essence so there is risk in getting close, but you can be rewarded by the heals it can give you and/or your allies. I also believe having it not stack charges when it on cooldown can prevent lane bully by blocking attacks from W active and still collecting charges to keep healing himself.