While the turnarounds can take a long time, they are very transparent about how long each service can take and offer a tracker on their website to keep you posted about the various stages of your collectibles' journey to the States, when it's being graded, and the journey home
Legality depends on the tournament format -- Wedding Ring can be legal in some formats and banned or restricted in others
This card's ATK equals the combined ATK/DEF of all "itsu" Fairy monsters in the GYs
Red can easily generate mana advantage as well, be it through bursty rituals (Irencrag Feat), treasure tokens (Dockside Extortionist), free spell/polymorph effects (Fires of Invention, Tibalts Trickery), or the occasional outright mana dork/discounter/mana multiplier (Leyline Tyrant, Mana Echoes)
Our singles inventory changes regularly, so visiting the store is the best way to see what is available