Going back and taking another look at the festival banners now that I have Eiko's burst, since it (a) removes one of the banner 4 grand prizes; and (b) gives me a new anchor for physical teams, especially those that focus on multi-hit abilities.
Ultros Selection: Shout is now a bigger deal if I'm going to run purely physical teams at any point, since the extra 20% boost compared to Onionburst is more significant with critga backing it. Not sure that's enough to make me spend mythril on this.
Banner 1: Still awesome. Kain's burst in particular is a bigger prize now, not so much because of the burst commands themselves but because of how critga can benefit Lightning Dive spam. Sephiroth is also more likely to see usage with that shiny 10-hit SSB.
Banner 2: No change. It's a magic-focused banner, and full of things that are more sidegrades than upgrades. Yuna's BSB2 and Exdeath's SSB are nice, but do I really need to stack five 30% faithgas? (Counterpoint: I could run a team that stacks five 30% faithgas!)
Banner 3: Somewhat better. Refia's burst is still a big prize, and Noel's instant SSB that adds two more instant actions seems like kind of a sleeper. Lots of dupes, though, and the OSBs are underwhelming.
Banner 4: Oddly, not that different. Eiko's burst is a dupe now, but Ramza's gauntlet that makes crits do double damage is much shinier with a 50% crit rate. The stoneskin effect would also help out if I'm switching Y'shtola's burst for Eiko's, and the two together makes Yda's burst that relies on not taking damage more usable.
Banner 5: Obviously Eiko's USB isn't a big deal now (though still situationally useful if I don't get any other source of Last Stand). Beyond that it's a mixed bag, especially since I've already got Luneth's burst. Big prizes would be Jecht's burst, Garland's ATK/DEF break, and Cid!Shout. Might consider it if I strike out on Ultros, maybe?