Is Kayle only playable with p2w relics?

I'm hoping I'm missing something but for the life of me I cannot even start any of the 5* maps with Kayle at 4 stars. She's level 26, so maybe it's a third rare relic making the difference; but honestly I can't even cast her typically before I'm dead. Is there something I'm missing? I keep seeing all these posts about how good she is but when I check the build it's usually her special relic which I'm too broke for.

Any advice would honestly be appreciated