Originally Posted by
citrique
On the only two fights you would generally always have someone in your raid play arcane on right now:
- You don't use shard on spine because you want burst
- You should use shard on madness because your job as arcane is burning specific targets rather than AOEing, thus miniburns and IA (mana shield) are used very frequently and regen is key, thus being at higher mana at the end of a miniburn is more beneficial. This despite SoW's haste on-use being relatively useless as you can't possibly drop enough haste in T13 BiS gear.
You could play arcane successfully on Ultraxion if you wanted and CotC's proc would be the weakest there where there's only one target.
You could play arcane successfully on Blackhorn and IA is very useful there as well raising SoW's value.
The key sims and people will miss is that with 4pc T13, you can use arcane power every 37 seconds. With it glyphed, mana shield does not have a GCD, therefore using mana shield is trading its mana directly for spellpower with AP up, drastically improving SoW's value as you can stay at higher mana longer despite doing this. Doing this every single time you use AP is a gigantic DPS improvement even playing in a conserve state with SoW. You can do it twice per AP.
Consider: Mana shield is trading roughly 7-8% of your mana for about 17-19% improved spell damage (in BiS gear) for 10 seconds. The limiting factor has always been the wasted GCD spent on mana shield making such use a wash outside of having AP up. With the T13 4pc, AP is up so often that this GCD penalty is removed, so on fights with constant raid damage (madness, ultraxion, etc) doing this is a DPS increase, making SoW's mana saving impact greater.