QoL and Thematic Shen Changes

Shen has been alive for a while now. He's by no means a bad champion, but his kit is just a little old and rusty, not to mention lacking a bit of theme. I have a few ideas on how to improve him slightly.

First of all, he should probably be updated to have scaling MR. The only other tanks that don't have scaling MR are Maokai and Singed, who may need it as well. If there is a reason behind not having it, then so be it, since it's worked decently for the past several years.

Next, he needs a couple of gameplay buffs to improve his combat abilty as well as splitpushing ability. What I propose is that his W should be given some sort of HP ratio, maybe 10% bonus HP. Added to this, he should be able to reduce his passive's cooldowns on turrets, maybe half the reduction (.5 seconds or 1 second while Feint holds). This will still give him the definitive weakness of low waveclear while allowing him to go through towers slightly faster.

Finally, what I think is most important is his thematic identity as a ninja. A lot of people say that his taunt doesn't make sense for a ninja, but I have to disagree. One of a ninja's best tools is a distraction, which is exactly what a taunt is: a distraction from attacking the carries. My problem tho is that it's not like the other ninjas, super mobile and stealthy (well some of the ninjas, not sure wtf kennen is doing as a ninja), so I propose that Shen should be put into stealth during Shadow Dash's travel time, reappearing when he reaches his destination and taunting all enemies he passes through. This will give him some stealth to his kit, adding a bit more thematic clarity. I mean c'mon, it's called SHADOW DASH!!!

TR;DL: Give Shen scaling MR, HP ratios on Feint, half the auto-attacking cdr for his passive on towers, and stealth on E to improve gameplay and identity as a ninja.

And how cool would it be to invisibly dash from one top lane brush to the other...