Also reprinted fetches means I can actually borrow blue fetches from my friend when I play Storm, since the only spare blue fetches he had before were just 4 Tarns, now I can play the full 7. Should also make getting the last 3 fetches for Storm on mtgo cheaper for me too.
Most exciting part of what Kahns has added though has got to be Treasure Cruise and Dig Through Time, though. Along with Jeskai Ascendancy, although I'm personally happier for the first 2. Although the fact that Jeskai Ascendancy gives standard a real combo deck (as opposed to whatever sort of combo Green Devotion was with BTE) is much appreciated and I think it gives standard a fantastic new dynamic that it hasn't had for too long. Treasure Cruise is just the best thing in Legacy. I've been playing a Jeskai Delver list this evening on xmage a ton using Bob Huang's main deck, although with Polluted Deltas over Arid Mesas for bluffing reasons since there's no basics anyway and both get all of the duals available, (here: http://www.channelfireball.com/articles/cruising-to-victory-in-new-jersey/ there's a bunch of lists in the article, I'm using the Jeskai one (obviously)). I've also adored Dig Through Time's impact on modern, both as a card Twin can use to make it even more consistent, and as a cheap way for control decks to dig for their win cons/Cryptics late in the game. My favourite play was probably just Digging into 2 Esper Charms and drawing 4 extra cards in the control mirror when we'd both been exhausted of resources.