Azlar is worth the rings. Against any green tank, my Azlar and Mistuko, both maxed and emblemed +4, flank my Ares +4, joining the team is Wilbur and any other red hero of my choice or Alberich as a safety net. Scarlett (against nature titans) or Boldtusk (in raids and in wars if I think some of my heroes need to replenish their health, especially against initial bad boards). Scarlett/Boldtusk/Alberich - Mitsuko - Ares - Azlar - Wilbur. When the manas fill up, I fire Ares’ skill then followed by Wilbur’s. Mitsuko will do damage and some mana reduction depending on which side has advanced manas, trying to avoid hitting blue heroes in order to repel their offensive skills back at them. Azlar fires last. With this line up in wars and in raids, the battle is the shortest, believe me. Ideal against green tanks but this monochrome combo may be used effectively against any other elemental tank, except ice.
I was trying to replicate the same team for use in wars in case the enemy has a unitank of green as I have a second Mitsuko, second Wilbur, second Scarlett, and second Boldtusk using Colen in Azlar’s place. As soon as I maxed Colen, a second Azlar came out from my TC20. I do have 13 more rings but only got 10 hidden blades, and some are already reserved for my Gravemaker almost maxed at the third tier.
At any rate, good luck with your decision.