Pros
1. shen is a great peel champ who will protect his adc
2. Has great mobility for a tank can dash through walls and make great chases and escapes with his E
3. A champ who's ultimate reloves him to be slefish as he can help his team in fights and make plays by keeping them alive or starting them.
4.Can carry botlane real quick, ig adc id lacking in brain cells.
Cons
1.team reliant, while with shen you can control the game, there is only so much you can do if enemy team is fed.
2. Has only one cc spell dont miss it or the play is flopped
4. can get out poked by long range champs.

It all started this season , that i picked up shen for support, I previously seen one of my friends play shen support and I was amazed of how he controlled the game, and then after i picked him up and had a rough start died too much didint really understood how he worked but with time i got the hang of him, just today i went 4-0 in ranked(im in bronze 3 now, I know i suck ik still new but always learning) so i figured this could be my chance to become higher ranked so that i can play with my friends who are in higher elo than me.but also i finally found a champ who is for me, He is very fun to play the damage you can do it insane and your naturally tanky Hope you guys find him fun too.

Flash-E
Alot of people do flash then E but if you time it well enough try E and then dash to the location of the enemy this will catch them off quard and setup a kill

E-auto auto-Q-auto-auto-auto-W
this sequence not only do u maximize shens attack potnecy with his empowered autos but by W you dont give them a chace to touch u at all, If you do this at level 3 to the adc no(has no flash) he is dead. also always look to bait out enemys dash with E.

R-E-auto-auto-Q-auto-auto-auto-W
after ult immediately use E on any enemy nearby yo taunt them and help get a kill or two.

so you might wonder ok I know what build and runes i have to use but how do i play him support? I can give you guys tips from my personal experiences on how to play shen support.
1.laning phase
you at first wanna not like not die, im not joking try your best to stay alive, only times when you allowed to die is either you die saving t adc or trading your life for another preferably the enemy adc. Think of yourself like a playmaker your kit allows u to make plays other's can't from a 1v3 to a 2v3 and trade your life for 2 it balances out. communication is key, when you ult signal before hand to your ally and let them know to engage because oull be there soon.

Post level 6 look to roam and help with objectives and get kills ot ***its by helping teammates across the map, never find yourself alone, while you can 1v1 alot of champs even as a support. you will not win a 1v3.speaking of 1v1s, Your W blocks autos for likr 2 secs, so any champ who is an auto champ is scared of u and you can kill them in some cases.

keep good map awareness at all time especially before just as your gonna hit level 6,The plays you can come up with are game changing, please critique me this is my first guide always looking to improve if my guide helped you guys like its doing to me now, its lit.
my goal is to reach bronze 1 and soon sliver im only getting better, stay frosty.