Nightmares Upon Nightmares

Hobbesgoblin wrote:

How does NuN interaact with infernal minions?

my understaning so far was, that i can decide to "lock" them, while they are already locked (since the do not automatically unlock at the beginning of the unlock phase) and then can unlock them voluntarily with the infernal payed unllock.

Correct. Once you've handled the NuN effect for a minion, you can unlock it afterward.