Skellige Storm and Nature's Gift

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Skellige Storm and Nature's Gift

I just played the game against spell ST deck and opponent used Skellige Storm from his hand and right after that he played Nature's Gift into another Skellige Storm.
Here's description of Nature's Gift: Play a Bronze or Silver Special card from your Deck. Shuffle the others back.

So I have a question, how he could play Skellige Storm via Nature's Gift from his Deck if Skellige Storm is silver (unique) and he already used it from his hand?
 
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