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However, we can use the results we do have, scarce as they may be, from non-official or older Japanese tournaments, to get an idea of the metagame

A couple of interesting points about the VS series

2) Magus Lucea Kane: X-spells, but louder Magus Lucea Kane is for anyone who has ever looked at an X spell and thought, What if it happened twice? She taps for two colorless, and then sets up a delayed copy effect: the next time you cast a spell with X in its mana cost or activate an ability with X in its activation cost that turn, copy it

Yes, you can play instants or activate abilities during your opponent's main phase if they have passed priority