Using mirage gate soft lock

KunoDemetries

I like to mess around and test my deck vs the AI to get a general sense of how it plays. I had used mirage gate whenever I ran out of cards in my deck and it froze the game where I couldn't click anything outside of retreating my Pokemon which it wouldn't let me switch to my bench.

I'm unsure if it is related to only mirage gate or any card that typically searches the deck but it completely froze and I was only able to concede.