I realise now my only strategy in Gwent was using spies to overwhelm the opponent into using all their cards while I still had a full stack.
there's a reason that strategy doesn't exist in the standalone game
because geralt is gold by default, you gotta either use it on the other witchers ( vesemir and co )
or remove the gold from geralt which can be done with a few cards afaik
One of the potions is pretty clear that it only works on non-gold units, but the other one has a wording that implies it can work on non-gold or ANY witcher card, I was confused when I tried it :/