Swallow Potion and Thunderbolt Potion doesn't work at all on Geralt. That's so disappointing. I hope CDPR fixes this bug soon.
It's not a bug. They work on non-Gold units like: Eskel, Lambert, Vesemir :)
Ok I got it now. Thanks for the clarification. CDPR needs to modify their description of Thunderbolt as well, to clarify that this effect only applies to non-Gold Witcher cards.
No you just need a better understanding of the basic rules of the game. Though maybe CDPR needs to make it more clear that gold cards, generally, can't be interacted with.