A speedy Melee focused [Wisp] that doesn't [Sacrifice] much. 5 Forma is easy to get, getting and ranking up the arcanes may take some time though.
But once health motes are held and Arcane [Guardian] Proc, this turns into a 8100+EHP build.
Good luck getting killed

update
I switched out [Augur Message] and [Narrow Minded] for Adapation and [Coaction Drift] and replaced the useless Sol Gate with Empower.

This allows for one of the highest possible Ability strength multipliers without a complicated setup like growing power/[Energy Conversion].
Adapation is just for late game survivability, but can be left out if you dont feel like burning the extra forma.

[Steel Charge]+[Coaction Drift] increase your melee damage by 79.35% (which stacks if other squad mates also have the mod)
That plus the empowered haste mote giving you +80% attack speed makes melee even more broken (if you can spam E fast enough xD)

So its just. Hit 4. plop one mote down, hit 4 again, next mote. and then have fun on your 999h survival missions.

And unlike many other frames, wisp's support doesnt get worse from becoming a solo-destroyer. Since everybody who picks up the motes, gets the same, borderline broken buffs.

Black palettes and using a scythe add +666% cool points, which will make most enemies delete themselves from the game code.