Looks like the update switched the Goldnight Castigator bug. He now takes double damage but the planeswalker does NOT! Prepare to face him in every red deck until it is fixed 
At least Goldknight is a mythic so it won’t be appearing in every deck like RC. 
thx for the heads up. i will be abusing him before they fix it
Wonderful!
8 mana for 8/16(8) without double damage penalties to planewalker… no brainer!
I’ve been playing it all day, and double damage is not broken. The part that is broken is the red damage number isn’t showing the multiplied damage, but you actually take the correct (doubled) damage. E.g. a 5/5 attacks me, it shows a red 5 but I actually take 10. Glad I just got her though, takes RC’s place as my cheap cloak target in Koth.
Comboed with Haunted Cloak and Enshrouding Mist is a favorite for me. He’s pretty risky using otherwise
It won’t be super prevalent in QB, but they will just feature it in an event deck…
I noticed the same thing. Hitpoint indicator shows normal damage but the actual damage is still doubled.