I think I know the answer to the problem but I have some doubts and I need confirmation or an explanation to which I can point when this happens again.
I have the following scenario in Dominion Nocturne.
The following to 2 cards are in the game:
in a previous turn, one of the players played and trashed Pixie. So now there is a pixie in the trash.
In my turn, I play Necromancer which allows me to play a card from the trash. I choose to play "Pixie".
Now the question. Can I trash the trashed pixie to receive the next boon twice? or I just get the "1 card 1 action" and I discard the top boon?
Based on what Adama wrote as an answer on a different question ....
The golden rule in Dominion is follow the card instructions as much as possible. [...] However, you may not be able to execute some conditional effects, e.g., trash the card
I conclude that I cannot trash an already trashed card, but there is a chance I got this wrong. So...which is it? can I or I cannot trash a trashed card?