Bug since last extension went on and while playing direct match with Sparky. If you're playing a deck including "Brideciel allègre" (in french) Sparky is unable to play instants that would involve a mana cost adjustment and the game freezes. All we can do to resolve this is to leave the game.
Envious Spartan#21907 commented
Still does it and it’s annoying. Not just that, her consistent “Hmm”s too. Their programmers really need to work on her.