In MTG Arena, Flash (instant speed) effects will often not be allowed to trigger during opponent's turn
In MTG Arena, Flash (instant speed) effects will sporadically not trigger at all, or be allowed to be cast during opponent's turn. This happens seemingly randomly, and the opponent's turn will progress without any option to cast instants or Flash abilities.
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vote
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Rezzahan#77802
commented
Most likely because cards like Voice of Victory and Grand Abolisher exist, and are currently legal in Standard. And highly playable for exactly that reason: to stop the opponent from interfering with the turn. Nothing random about it, just you not paying atention to your opponent's cards.