Wording Issue - Faunsbane Troll
The card Faunsbane Troll states that you can sacrifice an aura attached to it to fight another creature. It does not state "an aura you control" - my opponent attached Stab Wound to my Troll and I progressed through to my next main phase assuming I could sacrifice the Stab Wound since there is no statement about the aura being one I control. I lost the match due to subsequent events leading to my loss of the Troll. Frustrating and very poor wording that should have been corrected by now.

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[Deleted User] commented
The RULES only allow you to sacrifice what you control.
701.17a To sacrifice a permanent, its controller moves it from the battlefield directly to its owner’s
graveyard. A player can’t sacrifice something that isn’t a permanent, or something that’s a
permanent they don’t control. Sacrificing a permanent doesn’t destroy it, so regeneration or
other effects that replace destruction can’t affect this action. -
ShrimpSandwich#58239 commented
My opponent cast bitter chill on my Faunsbane Troll. The wording on the troll does not say it must be an aura you control. I could not sacrifice it and it led to me losing the game.
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[Deleted User] commented
The rules allow a player only to sacrifice what they control. You cannot sacrifice what you do not control. An opponent's Stab Wound is still controlled by him, even if it is attached to your permanent.
701.17a To sacrifice a permanent, its controller moves it from the battlefield directly to its owner’s
graveyard. A player can’t sacrifice something that isn’t a permanent, or something that’s a
permanent they don’t control. Sacrificing a permanent doesn’t destroy it, so regeneration or
other effects that replace destruction can’t affect this action.