His tile damage is good but that’s about the only reason to ascend him over G.Kong or Anzogh - and OP already has Anzogh (it’s also not the best argument for him, in that he’s not the top red for tile damage either - Elena has him beat even without costume bonus).
It’s not that he’s bad as such, but that much better heros exist to fill his niche and the OP doesn’t need to be in any rush with his bench.
G.Kong especially is sturdier, hits harder upfront at faster mana and the difference in tiles is insignificant… okay, OP doesn’t have GK, but he does already have a useful selection of good reds and I just don’t see where Azlar would get any playtime except for rush tournaments.
I wouldn’t ascend him assuming there will be a costume - there might not… And you wouldn’t want to be in a position to ascend him assuming you’ll get it and then feeling compelled to pull hard for it.
I’m typically an advocate for using what you have, but the rules change a bit with deeper benches - when ascensions become a bit more of a luxury because bases are already covered.
I’ll be honest, I just don’t see the point in OP’s bench… Okay hero, just not necessary here.