It was an accident, I didn't mean to exclude the card, I had so many informations inside there, so I'm wondering if I can reactivate him.
@Eduardo Baptista Ludwinski yep unless you *delete* a card you can always get it back. You can try searching for it in the top left:
https://help.trello.com/article/808-searching-for-cards-all-boards
searching archived items:
https://help.trello.com/article/795-archiving-and-deleting-cards
or finding the point at which you archived it in your board activity feed:
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