When an ability affects more than one player, the players take it in turns to trigger its effects, starting with the current player and proceeding clockwise (so the person to your left goes after you)
It all has to do with the games resource system, which stands out in contrast to systems in competitors like Magic: The Gathering and Pokmon Trading Card Game
But in just a few hours, we were both playing the game without looking up rules or making mistakes
Having played all three decks in both two-person and three-person play, we enjoyed the Sapphire and Steel deck the most, as its basically unstoppable (at least compared to the other Starter Decks) when ramped up properly
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Action cards of the Steel Ink type also have strong effects, dealing damage in copious amounts, so players will want to form a strategy that can combine Glimmers with Actions in their turn to really hurt their opponent