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You can manage & track your card collection and decks once you create an account and login.

What happens if I put this on a Specialist when there’s only 1 card left in my deck?

In that case, you’ll scrap that card. Then you’ll shuffle all the other cards in your scrap pile into your deck. Then you may play the card you scrapped. If you don’t, it will stay in your scrap pile.
Source: Wizards of the Coast (2019-03-01)    【Link to Ruling】
Tags: Field Communicator