Infernus last appeared in the Soulforge on February 26, 2018 - March 04, 2018.
I got enough gems to craft a Mythic shortly after that, and thought to myself “Oh, it won’t be too long before he’s back in the pool.”
Since then, EIGHT Soulforge resets have occurred, none of them containing Infernus.
There are 27 Mythics in the game, with 2 not being in the pool due to other crafting methods (Zhul’Goth and Xathenos) and one not being in the pool due to being released recently (Undine), so 24 in the pool. This means that it should take, at most, 6 weeks for a Mythic to cycle around and show up in the pool again.
If the Soulforge had a proper rotation, I wouldn’t have to wait frustrated week after week as I see Abynissia, Doomclaw, Draakulis, Famine, Ketras the Bull, Pharos-Ra, Queen Aurora and Skadi each appear in the pool TWICE. (Source: Taran’s World) Also Gargantuar’s in the pool this week as though they think anyone’s going to craft him.
I feel the developers need to implement a better rotation that keeps in mind the amount of time since a given troop last appeared.