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Professor Cozmo's Discovery
Deoxys · #90/107
Professor Cozmo's Discovery (90/107), the Uncommon from Deoxys, has an estimated ungraded market price of about $0.55.
As of September 14, 2026 · tracked daily by Riffle · estimates, not financial advice · how these numbers work
The modeled fair value of this card, with a confidence grade: what it should trade at, not just what it lists at. Part of Riffle premium, alongside price history and the full graded ladder.
About Professor Cozmo's Discovery
Professor Cozmo's Discovery is a Uncommon (90/107) from the Pokémon Deoxys set, released February 1, 2005. Ungraded copies currently trade at an estimated market price of under $1. The artwork is by Ken Sugimori. Riffle tracks its market price daily; graded (PSA) comps and full price history are available with Riffle.
Other versions of Professor Cozmo's Discovery
Professor Cozmo's Discovery appears on 2 different cards across the sets Riffle tracks, at very different values. This page covers #90/107 from Deoxys; the collector number printed at the bottom of the card tells them apart.
FAQ
How much is Professor Cozmo's Discovery (90/107) worth?
Professor Cozmo's Discovery (90/107), the Uncommon from Deoxys, has an estimated ungraded market price of about $0.55. Note: 1 other card named Professor Cozmo's Discovery exists across the sets Riffle tracks, at very different values; check the collector number.
Which Professor Cozmo's Discovery card is this, and how do I tell the versions apart?
This page covers Professor Cozmo's Discovery (90/107), the Uncommon (about under $1) from Deoxys.
The other version: #89/110 from Holon Phantoms (Uncommon, about under $1).
The collector number printed at the bottom of the card is the reliable way to tell them apart.
Should I grade Professor Cozmo's Discovery (90/107)?
It's roughly a wash: with a 7% PSA 10 gem rate and current graded prices, grading a near-mint Professor Cozmo's Discovery (90/107) is estimated to come out within about $10 of selling it raw (est.); grade for protection or display, not profit.
Assumes ~$25/card bulk-rate grading (standard service costs more); ignores turnaround time, sub-9 grades, and shipping. A screen, not a promise.
Is Professor Cozmo's Discovery (90/107) rare?
Professor Cozmo's Discovery (90/107) is a Uncommon. PSA has graded 43 copies to date, so graded supply is measurable and growing.
How rare is a PSA 10 Professor Cozmo's Discovery (90/107)?
Of the 43 copies PSA has graded, 7% earned a PSA 10. That's a low gem rate, so flawless copies are genuinely hard to come by. Grade-by-grade population and pop-over-time appear with Riffle premium.
More from Deoxys
Should I grade Professor Cozmo's Discovery?
Roughly a wash: grade for protection, not profit (est.)
Expected grading return from this card’s own PSA grade mix (7% gem rate; grades under 8 valued at the PSA 8 price) and current graded market prices, minus a ~$25/card bulk-rate grading fee, compared against selling ungraded at market price. Standard grading service costs more; centering risk, turnaround time, and shipping aren’t included. The exact PSA 8/9/10 prices behind this are part of Riffle premium. Not financial advice.
PSA population & gem rate
From the PSA population census, captured monthly by Riffle. A 7% gem rate is on the hard side; PSA 10 copies of this card are scarcer than the typical modern chase card. Grade-by-grade population and pop-over-time appear with Riffle premium.
- under $1 is the middle 80% of clean market activity, not the cheapest listing and not the most hopeful one.
- The band spans about ±27% around its midpoint: a wide spread, so read it as a range, not a point.
- Sampled daily since July 28, 2026, current as of September 14, 2026.
When the data thins, the band widens and says so, it never fakes precision. Exact source prices are part of Riffle premium; the band is Riffle’s own figure to publish. How these numbers work →