MTGO considers the card to be legal for Eternal and Pauper games.
It's possible some of these sources were incorrect, but the combination of all of these sources suggests Cryptic Spires is intended to be legal in eternal and pauper formats, which would mean Gatherer's records here are incorrect.
The impact of this issue is that it is unclear where exactly Cryptic Spires is supposed to be legal.
WotC Submission Number: Submitted but no reference number given.
Cryptic Spires is currently marked on Gatherer as not legal in any format.
This contradicts multiple other previous and contemporary sources:
It's possible some of these sources were incorrect, but the combination of all of these sources suggests Cryptic Spires is intended to be legal in eternal and pauper formats, which would mean Gatherer's records here are incorrect.
The impact of this issue is that it is unclear where exactly Cryptic Spires is supposed to be legal.
WotC Submission Number: Submitted but no reference number given.