It's just past the dawn of the Elevation era (August 2025), and this card is a major player in one of the best decks right now, and since it's been 4 years since the last reviews, this card might be worth some re-assessment - a check up, to see how the Serum is working.
Jinteki has never enjoyed particularly great 3/2s, but without the heavily defensive 5/3s of yesteryear, a scoring pattern with 4 agendas has re-entered the red playbook. It's no longer fundamentally wrong to have 11 or more agendas, and this card sees play - though of course it's still 1 per deck.
One thing we saw in System Gateway was an idea that Jinteki sometimes throws their cards away for advantage, and in the sets since then we saw quite a few cards like that- and, at the time of writing, the most impactful of all, an ID that mirrors MaxX - where acceleration through filtered drawing is everything, but a lot of cards end up in the bin, by the Corp's own design. Including this card, which can give you an additional AU Co. counter if you choose. With the addition of Sabotage from the runner (amongst other tricks), that's a lot of scope for important cards to end up in Archives.
This changes Longevity Serum's place in the Jinteki ecosystem quite a bit - no longer is it a Spin Doctor that is worth points, instead this is a reset button, a renewal - a way of recouping some of the options you sacrificed for progress, returning to old ideas... or bringing back threats the Runner thought they dealt with. The runner can have trashed all 3 copies of a kill card, but if you score this, should you wish it you can bring all 3 murder cards back, and return the runner to the cycle of suffering.
There's one last card worth mentioning with this agenda, possibly saving the best till last - Moon Pool. Because Longevity Serum is a 3/2, you can install it, install Moon Pool, and if you have 2 agendas between HQ or Archives, you can advance and score this, shuffling back a total of 5 cards, at least 2 of which are agendas - an absolutely massive swing.
As a Limit 1 Per Deck agenda, Longevity Serum will always have a fundamental weakness, but its strength shouldn't be ignored - it's not a blank by any means