She’s not terrible, but there isn’t really much of a reason for me to use her. Similar to paper, her abilities take a while for any meaningful payoff, but if you have the right cards the slots she comes with offers some flexibility in the types of builds you can make.
That being said, I think she might be too slow for the exile kill and your crystals may be better spent elsewhere.
I wonder why the thread isn’t updated to reflect last update to Kaya. Her 3rd ability no longer returns cards from exile, and gains life equal to damage to deal. This buffs her greatly.