deep cavern bat
deep cavern bat did not return my card when I killed it.

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jenlaw23#77313 commented
Just happened to me as well. You can see where the card should be in the 2nd image, and I could click and drag the invisible card and it'd highlight mana, but I couldn't play it. Lost me the game...
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Nandoss#70687 commented
Had the same issue. My opponent played Deep-Cavern Bat exiling my Bristly Bill. Then in a following turn he attacked with it which I blocked with my Waterwind Scout which killed the Deep-Cavern Bat, but instead of returning my Bristly Bill to my hand it kept it attached to the Deep-Cavern Bat as it went to the graveyard and created an invisible card in my hand. I could not in any way play my Bristly Bill after that.
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RAB3#73373 commented
Same here too
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CommunistIdiot#26093 commented
Same