Eater seems to be the run event's best AI breaker to date (when it comes out). Aside from Swordsman, I reckon Crisium Grid's utility will jump up the scales as well.

What's great is that even if Crisium Grid is a hard counter for run events, it doesn't stop the "utensils" from ripping a server open for a succeeding run. Imp or straight out pay-to-trash solves what may be a temporary delay.