A bit of a joke build.

Jump up, aim, and you don't move at all for quite a while, taking advantage of [Zephyr]'s +150% crit chance while airborne & all the damage reductions.
Have a polearm equip to get the last Boreal's and Motus.
The Motus set also has a shotgun mod that boosts crit chance another 100% after landing from a double jump.

Find some high crit chance shotgun with a super high riven disposition.... maybe a funny way to get crits.