There's really no drawback to it. If you're in secrecy, it's free and essentially gives you resources. If you're not in secrecy, it reduces your threat, hopefully back to secrecy! And either way it gives you a card. Simply put, this card is awesome. One coin (or nothing, in secrecy!) for 1 card and -2 threat in ? Thank you very much, ALeP!!!
I would say this card is also great with Valor decks, especially Mono-Leadership ones. Pay one resource to buy yourself two extra turns while thinning you deck is amazing.
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NERD
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