i was playing in a game just now vs a blue deck. Brineborn Cutthroat was in play under my opponents control.
Its text states, "whenever you cast a spell during your opponent's turn, put a +1+1 on this creature."
During their turn, they cast two spells and both of them triggered the Text effect.
This should not have happened, as the text states that the effect should only happen when it is my turn, not theirs. (me being the opponent.) This ruined my chance of winning this hand.