Quensguard is pretty much dead.
Its still fun to play, I can win, but not in the ranked.
Quensguard requires many cards to work: operator, draig, decoy.
Skellige has many tools to have this required cards: ermion, avallach, alzur cross, but still, quensguard lacks of many needed things for current meta.
There are several cards which 100% kills quensguards: katakan (a lot of monsters have it), caretaker, single vicovaro, goul (rarely encountered them).
So its still fun, but not for ladder.