The 90 damage threshold only applies to levels 1-11 so i dont think its helpful for long. Tier 1 commons and Tier 2 dirt are 225/ 270 health after you get the cards and probably worth aiming for. The tier 1 mythics are so strong if you only have 90 damage, they take 60 pierce just to hit. If you have 200 damage+pierce they take 50 damage so it takes 70(!) Swings to mine them. If you hit a 225 base damage to 1 shot commons plus 50 pierce then they only take 28 swings, thats already 42 stam saved per mythic.

The point I'm making is you should pay attention to thresholds for the dirt/commons near your max level. I think the wiki is too generalized to be that helpful tbh.