Deck after adding UWM, before filling empty deck slots:
Deck after filling deck with level 0 cards:
You'll see that the deck is claiming that 14xp was spent, because it's trying to pay 1xp per card added to the deck. However, filling empty deck slots does not cost any xp (see rules Clarification on Versatile
Deck before adding UWM:
Deck after adding UWM, before filling empty deck slots:
Deck after filling deck with level 0 cards:
You'll see that the deck is claiming that 14xp was spent, because it's trying to pay 1xp per card added to the deck. However, filling empty deck slots does not cost any xp (see rules Clarification on Versatile