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Bug in new patch - cannot adapt minions with Can't be targeted
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)
Daxxarri
Just a quick update: there's already a hotfix in the works for this issue, and we're hoping to roll it out today. I'll update this post once it goes live.