Faunsbane Troll bug
When I activate Faunbane Troll's ability, sacrificing the aura attached to it is a part of its cost, and therefore, should give me a chance to respond to that and allow me to pump its stats in some way before the 'fighting' occurs (with something like Titanic Growth, etc.). Arena didn't give me a chance to respond, and therefore, made a terrible decision for me. I still won the game, but I could've easily lost because of this bug.
I had a Ferocious Werefox in my hand, and I activated the Troll's ability, targetting a Grabby Giant, waiting for a response time to let me then cast the Werefox's adventure ability, allowing it to fight as a 5/5 rather than a 4/4. That didn't happen.
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[Deleted User] commented
You need to hold full control to do this