they are still giving out heroes... though need to work for it a bit. last month, login daily and you get the hearts that you can change for heroes.

similar thing this month... and you can get what is possibly considered one of the Tier S heroes -- Violet.

i already have Violet, so aiming for Raz...

in regards to Tier S, i use this list: https://samurai-gamers.com/arena-of-valor/hero-tier-list/