It used to be BiS since it provided easy instant cast (530 total stats). Now, it's not so much the case since it's super easy to get 530 total stats without buffs or stats foods. I've listed the gears below to demonstrate that you don't really need this combo to achieve instant cast.
Abusive Robe allows you to use improve concentration Lv 1 which can yield anywhere between 3-5 DEX for a minute depending on your base stat.
The Temporal Ring + Runaway Magic enchant will give an easy +40 INT among other godly stats.
If you want to play with RGN, you can also get up to +5 int and +5dex on your Bio5 headgear.
D.Wing gives +10 INT and +10 DEX, but you'd have to sacrifice not using a S.Coronet. This option is only for those need the extra headgear slot.
Shadow refine event is active at the moment. It's a good opportunity to grab the Dex shadow set which will give you +5 DEX if +9 and the Intelligence shadow pendant by itself will give +3 INT if +9 as well.
You can also join the Arch Wand Clan at mid Prontera for a free +1 DEX and +1 INT. See irowiki.org/wiki/Clan_System for more details.
Still not enough stats? The Costume Creative Convention Hat gives +1 to all stats. Maybe replace one of your precious accessory card for a Zerom card or grab a well-chew pencil.
Edited by VanishingPoint, 23 August 2019 - 10:59 PM.