With the right setup (something Hypnotic Deduction can help with) the combination of Robin Hood, Sneaky Sleuth and Robin's Bow will let you quest far ahead while simultaneously clearing off the damaged characters on your opponents board
This is already how it works for double-faced cards, so it makes sense for the same rules to apply here
You cant play in official tournaments without sleeves, but there are official sleeves with the same art as card backs
Oswald, The Lucky Rabbit Oswald is a great card for item decks, turning each ink you play into a chance to play an item for free cheating some of the biggest and scariest into play way ahead of time if youre lucky, or if youve found a way to filtre your deck just right
You can get everything, even obscure stuff like codes for special Secret Lair card sleeves or FNM at Home if you missed out on that
Both commander choices are great for the deck, and unlike most cases, where there's a clear "best" commander, the choice between Tidus and Yuna is completely up to personal preference (although Yuna is the stronger of the two)