A lot of players were sad that we breezed by the story of how two-color clans became three-color clans
In practice, shuffling once is sufficient, but effects that care about you shuffling your library (like Psychogenic Probe, for example) will see that you've shuffled twice
Regarding FF, I have played all numbered titles (FF11 and FF14 up until before the DLC), but fundamentally, this is not a story analysis, but simply an evaluation of the cards' performance
Goblin Welder is on the shortlist of all-time strongest one-drops, and its ability to turn a random mana rock or an artifact land into Blightsteel Colossus (or vice versa on an opponents side!) is simply unmatched
Promo cards don't count for Pauper legality, unless you are Headless Horseman or Zodiac Rooster