Turggvi is a top tier broken card.
Same way you counter any powerful control card: Heatwave, Yennefer, Baron, etc. Know it's out there. Play accordingly. Bleed it out or bait it out. Or just hope they didn't draw it. That's what the game's about. If you don't like your cards being messed with, I recommend Solitaire.
It all boils down to the same old "wah wah NG stole my value" whinology. VIncent is op. Yen is op. Damien is op. Skellen is op. Bribery is op. Is there any gold NG card that someone didn't say was op? Fact is veil screwed NG a lot. Vincent power-up isn't even close to making up for it. If anything from NG is op it's the new spy cards that produce a bit too much value for the amount of control NG has.