I forgot to mention one or two things in your comment Sheryl (btw thanks, I like those kind of message)One more point I would like to say is, we are lazy, we don't want to change. we build up an archer team and we hope it will be good enough... we build up an guardian team to counter archers, and we hope it will be good enough... we build up cass/rhea team to counter guardians... and we hope it will be good enough...
However, the devs don't think in this way, they actually want us to change... frequently, dramatically... so our resource will not enough to cover the cost of the massive change... and we need to spend some cash to make it up...
This is the very purpose of dark lord, and many new mechanics of new heroes. devs want to shift meta quickly... so people will make changes in their squad, and invest more resources on new heroes(actually getting new heroes itself is a lot investment already).
So my point is, if cass/rhea is so dominate that everyone just need to build cass/rhea team and win 90% of the arena match... the devs will be crazy and do something for it...
So we just need more time... anyway devs only tends to fix things when they notice their profit drops...
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I believe cass is OP, but she actually only OP in arena, where the turn flows so fast that it is possible to use a shadow as a mystic. Cassassin is so OP... yet no one use her in PvE... it is an issue but not very serious considering the reward of pvp is so little... I used to reach 4.6k point per week, but it dropped to 4.3k when everyone started to use cass/rhea team. so I lose A LOT in pvp, namely 20 gems and 40 blood tokens per week.
On the contrary, snow sdd is something you can actually use in pve, use in every floor of tower, use in every event map if boss have not 15-hit counter... ... This is a serious problem (as it will make players ignore upcoming heroes just focus on building a snow sdd)... so devs choose to fix that first... honestly I feel this is a reasonable, logical move of the devs.
First, we talk too much already about how much we need more Job keys, some players explained why, but the devs don't care at all. "Buy bundles."
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Secondly, it's not only about the arena rewards : it's about the game itself, the arena itself, the pleasure you can have playing this game. I don't care one bit about the arena reward (not much difference if you're not champion or legend)