Before ending the turn, you have the chance to cast spells, activate abilities, but once the decision is made, you transition to the next round

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The additional booster pack should help you stay in the race with your friends
Meria has potential to generate huge bursts of mana or huge bursts of card advantage when paired with cheap artifacts
Bagas done more than 220 Magic cards and even won a 2009 Chesley Award for excellence in genre art, so its safe to say that hes well-versed in all things fantasy at this point
It would be a bit busted if they went to the battlefield, especially on a two-mana card