Confirming what path00 reported, in that, if you are in the middle of casting a card and targeting, while a long animation is still going, such as Logan's ability, once the animation finishes, the card you were trying to play can be removed from the game.
Video showing bug below. As an FYI, I double-clicked on Crushing Blow in the video; it took me a few tries to reproduce this bug ^^.
SD | HD
EDIT: Filed as SE-208.
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