That’s it. Lost an arena game because of this 
You didn’t take damage
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Just to elaborate: When you play Deathbringer Saurfang for health, you actually pay the health but you do not take damage. Those are two different things now. They changed this in a recent patch (26.0 I think).
Here a link for more information:
https://us.forums.blizzard.com/en/hearthstone/t/they-are-finally-changing-itcosts-wont-be-damage-anymore/104841
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