I just read all feedback from players and i can confirm this;
-Portal elixir is totallly useless. (i used 8 elix which equal to 8 hour and maybe 200+ runs) and got heroic guapo, bejan and maria.
-I opened crate (store crate 30 plat & 4 legendary rarity 10 plat deviled crate) and got samael, bejan, singe, heroic thariel and heroic esteban.

Conclusion, better to just open crate than farming 1 hour where heroic and arcane is super low (even after buff).
Idk why must sts dissapoint us all the time. xD And i have one guess in the future, they'll probably nerf the rate from lockeds crate too xD