Zephrys the Great - Bug Exploit

Played against a priest (shadow mode) who had 3 cards in hand, empty deck. This person played Zephrys the Great, wished a card, then did 2 damage to it killing it. Allowed this person to repeat the card over and over, until I fatigued out. Each new turn their hand count went up by 1 even though they were fatigued. Was that a hack? There’s nothing on the card that puts it back in hand, unless there’s a card in their hand that does this. Am i missing something?

Game log on left side of the table shows most of played cards.

You might have encountered a bug which has been showcased by HysteriA (and most likely many others). Using that bug against another player would most definitely be an exploit. I am not linking to the videos showing that, out of concern that showcasing it is showing how to exploit it, and that would be against the ToS. You may want to report the player as explained in this post: