The new 7 or 27 limited stage (available for 24h in the limited stage tab) is really good. 7 stamina, doable as much as you want and make Rainbow Shards for rarity growth easily farmable.
Yeah great! I was about to ask your advice about farming that stage, I want thousands of them!
It comes at the very right time, I need to upgrade quite a few 5* to try Sigilaria.
I'll just let my team farm this stage for a whole day and see