I'm not sure how Clear Vision is supposed to work. I mean, I understand your intention, but... In this screenshot, you'd think I could target the Cannon Turret with 8 Health, clearly marked as being above normal, but I can't target anything with the card. (Shouldn't that Cannon Turret be a Silver upgraded card, by the way? I don't know where else that extra Health could come from.)
Also, "default values" implies that you'd heal a card to default Health if it's been damaged.
It's simply very confusing to understand when you can use the card. (I know you intended it to remove buffs from enemies. I haven't actually managed to start a test fight where I could try that.)
Since we can also only target enemies, we lose what could have been a better use of the card: To remove debuffs from our own units.
Now, if everybody understood "buff" and "debuff" those would be the terms to use on the card. You could of course use those as keywords on cards and put that keyword on cards affected by them. So, "wall, robotic, stationary, buffed" would be targetable by Clear Vision. I don't know, I'm not sure there's an elegant solution, unless somebody can make up a really good text for the card that explains exactly what it does.
that's why sometimes (randomly) it seemed to not work! Now I've added checks for it.