A few comments, first it's a fun concept and there seems to be some semi-good design choices in some sections.
That being said there are two major issues, one is communication and the other is technical.
Communication side I have no idea what determines how the cards decide what they are attacking aside for the sneak cards which always get hit last. Sure your card order is from left to right but not what card is being attacked. Given that positioning is a massive part of an autobattler and you have a ton of cards that are designed around getting attacked this is somewhat of a problem for strategy.
Technical side there doesn't seem to be a way to remove a card from your hand and put it on your bench unless you upgrade it which seems like an oversight.
I've got other issues with how the bots gain just get what they want but I think the above two issues are more important.