The best melee Incarnon, if you want to actually melee stuff, is the Hate.
If you want to use it as a stat stick for abilities, it's the regular Magistar, given that you have Magus Aggress.
The Ceramic Dagger is fine in either role, but where that weapon in particular shines is as a stat stick for Mesa with Secondary Outburst on a secondary.
If you have a build that wants to kill with finishers (for example to proc Arcane Trickery), the Furax Wraith can do that fairly effectively with ground finishers, if you use Larva or Pull to group them up.
The Prisma Skana can get 53% base crit chance and has high damage on it's combos, I don't think it's very effective regardless but maybe you can make it work for some purpose. It can certainly kill Acolytes really quick like.
The only thing on Elemental Ward that increases your damage is the base damage bonus on weapon swap from the toxin version - and this is negligible since you'll also have base damage from Vex Armor.
The bonus does however act as a multiplicative bonus in some instances (because everything in this game is bugged).
Traumtulpe's post in Question about Deep Archimedea Score was marked as the answer