Soul Leaf Warning message SHOULD NOT EXIST

Soul Leaf exists ENTIRELY for the purpose to gain XP for your Cards.
Having this stupid message pop up if you REALLY want to use it EVERY time you click on it is unnecessary.
In fact its useless having to click on it in the first place as it should be applied like Stat Potions, automatically on acquirement.

It defintly makes it seem like the player is doing something wrong.
Like you see this message and it seems like there is some hidden system to it.
Then off to google and youtube to try and figure out what the heck it is about.