This doesnt go in EVERY spellslinger deck, but it should go in every deck where the commander is a Wizard OR Shaman, which will almost always contain Red and will keep getting printed
Games are played 1v1 in best of two matches (one match where player A goes first and another match where player B goes first), but the players who submitted the decks do not actually pilot the decks, instead, the games are played automatically under the assumption that both players have perfect information and will only make decisions that will lead to a win (or a tie/draw in the case where a win is not possible)
In fact, this is true for all the Final Fantasy Commander decks, something I was pleased to see
Draw a hand of stuff, mill massively, then craft at least 40 power and attack once to win the game
A foil card has the same rarity as its non-foil version (e.g., a "foil rare")