Traya has crit avoidance in her lead
they've started using that in kits and toons some months ago. Zaalbar has some on a unique, as does Bindo. I'm sure there are others, but none from the top of my head.
Makes the toons tougher, as a lot of the hardest hitting arena teams in the game are crit heavy, without raising health (venerable to %health effects like JTR) and defense, which has diminishing returns (but still effective, just look at Bossk lead)
It works just fine, as Traya became meta. If you crit on them, you do less damage. If you don't crit, you do less damage anyways. Then Carth brings some tenacity along, because if you don't hit hard you probably rely on debuffs (but, not too much tenacity as this seems to be a good team, but not a meta team) and some potency for the almight DOT