As the mods have yet to bless us with one of these, I figured we need to take it upon ourselves.
To start us off, why not some NWO splats?
First, the "clear":
followed by 3 waves of 600 more catapults
Next, the "finishing blow":
At least Joker (very aptly named) remembered his rams.
PSA for NWO since they don't seem to be aware:
Artifacts spawn April 20. Good luck.