Blink and you missed her! Confirmed as alive after many years only to be killed again (off-panel, no less), Siena Blaze and the Upstarts reformed briefly during the "No More X-Men" arc. Given the circumstances, her fate is by no means certain, and the Mistress of the Electromagnetic Storm may return yet again at some point in the future. https://uncannyxmen.net/characters/siena-blaze
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I think there’s an error. The data page says her first actual appearance (not Stryfe’s Strike File) was Uncanny #301. But the biography and the issue checklist show Unlimited #1 as being set before that. According to UXN, Both issues have the same cover date (June 1993).The Uncanny appearance has dialogue that refers to the Unlimited story in the past tense.
I guess its possible the Uncanny story came out a week or so before Unlimited, but I distinctly remember reading Unlimited #1 when it was released and thinking of that as her first appearance. I’m pretty sure Unlimited #1 was her first actual appearance, not Uncanny #301.
Unrelated, but the not-quite reveal at the end Unlimited #1 was the first development in the chain of storied that led me to quit X-Men. I felt that retconning X-Men #3 so that Magneto was alive was a betrayal of CC and his swan song. It was all downhill from there to AOA when I quit altogether.
It was something that confused me as well, so a while back I did research on the release dates for UXM #301, X-Men Unlimited #1, and Uncanny X-Men Annual #17. Not just the month, but the week of release (as they were all June 1993). They arrived with UXM #301 on the first week, UXM Annual #17 the third week, and XMU #1 the last week.
Now, I'm only going off a website's archived data for that information, so maybe the issue did come out in a different order in reality. There's precedent in certain examples, though:
Gambit - Uncanny X-Men Annual #14 apparently arrived earlier than UXM #266
Carol Danvers debuted as Captain Marvel in Avenging Spider-Man #7 instead of the actual event in Captain Marvel (7th series) #1.
Jim Rhodes was seen as the Iron Patriot in Gambit (5th series) #13 before his debut in Secret Avengers,
etc.
"If you want to tell people the truth, make them laugh, otherwise they'll kill you." -- Oscar Wilde
Well, your research is likely more reliable than my 25-year-old memory, but all these years I’ve “known” Blaze’s first appearance was in Unlimited #1 based on reading the books at the time. I ain’t gonna change my truth based on your research! ;p
(I do remember Gambit’s out-of-order introduction though. I was a new comics reader, and it was among my first lessons in sorting out these kinds of glitches).