Thanks for the comment!
You're completely right, I have been planning to add this. I'll put it into the next update for sure. When mousing over a card the effects will be displayed to the right with an explanation.
As for sound effects, I would like to improve these for sure. I also want to add more particle effects to the game so there's a bit more impact, especially for certain skills with more unique effects such as Drip or Horny.
Thanks for your feedback, I'll keep working on it!