devtrackers.gg
Source: http://gall.dcinside.com/mgallery/board/view/?id=pebble&no=2099125&page=1
You cannot adapt any minion that has the "Cannot be targeted by spells or hero powers" keyword. (The OP in the source tested with Crackling Razormaw, Lightfused Stegodon, Volcanosaur on the second adapt and even Vicious Fledgling's unique ability)
Edit: blizzard dev commented to say that they've hot fixed the issue now. https://www.reddit.com/r/hearthstone/comments/8otixb/_/e067fb9
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