Hello with this technique and a paladin using spell power/tanking gear I have soloed all these dungeons:
aq20
karazhan
magetheridon
Old world dragons
Zul gurub(even hakkar but not junxu or whatever his name was)
DOom lord kazzak
All 70 heroics exept shattered halls
Talent Calculator - World of Warcraft
using mostly t8.5 and toc gear I have the following stats with kings:
30k hp
2200spell power
19k mana
I use a Valanyr but it has nothing to do about the shield effect you can use any 550+ spell power 1hander and it will work well I use shieldbreaker wall as a shield and just mix gear really.
I have an intelect trinket and heart of iron and the rest is x2 t8.5 healing x2 t8.5 tanking
basicly keep ss up and spam fol wil auto attacking
some fights take alot of time around 30-40minutes but yeah its worth it.
Leave this open for discussion imo and post your own strategies if you want to.