Bug report: Morgvark Heart of Terror

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I have just finished a game where the opponent play Morgvark Heart of Terror onto my Street Urchin and killed it. It should not have happened. It should leave my street urchin at 1 health according to the description and my own experience with the cards. Please look into it. It literally costed me the game on pro rank.
 
here is the video of the problem bellow
the game just refused to work after some break points, idk why first time game counted this as a draw , second time it just freezed but on my friend computer it continued,
and i was not able to use my card second time
 
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