Shen Rework Small Update

Shen is currently not the best in top lane nor support, so maybe he could use a small update again.

Anyways here's my idea:

P: Current passive applies on every Q from now on instead of all spells.

Every 15 seconds, Shen's next basic attack uses his vorpal blade. Vorpal blade basic attacks again 175+ range and mark the target. Shen and all champions who basic attack the target will life tap it. If Shen Q's the target, the mark is consumed, executing minions or dealing damage based Shen's armor while healing 4% of Shen's max health if the target is a champion or a Large/Epic monster.

Q: Current Q

W: Current W + Any shield from Q will be applied to allies within the W. Shield lasts 3.5 seconds.

E: Current E. Consuming Vorpal Marks cuts cooldown in half.

R: Current R: No changes.

This would hopefully give Shen a bit more sustain and make him a bit more popular and viable for the roles he is suited for. Currently he is not bad, but there are better top landers and tanky supports. My main fear is that this would overload Shen, but numbers could be changed or other changes.

Please comment below. Simple down votes do not help me get any better or learn. If you like/dislike this idea please post below why you do and what I could fix.