Hi!
First of all thanks for your hard work.
Reporting some bugs on the Valkyrie cards :
You fixed Nibelung's Treasure ; it does allow us to choose the card to be activated by the opponent. Ironically, all cards can be chosen this way EXCEPT Nibelung's Ring, which kills the purpose of the card.
Also Wotan's Judgement doesn't shuffle the deck after switching cards, which also kills the purpose of the card.