I think Kaylia is a great choice!

I got one copy out of a pack pretty early. Since then, I'm pretty sure it has become my most played Archon. It has a great synergy with a lot of cards which I already played a lot before (like the Blackmoor Wild Elf).
Also I think it's quite good in the current meta because (at least in Bronze/Silver) magic teams in general are quite strong atm.