The guy selling that card on Allegro is saying the same as the op, a flexible card with a changing limit. Might be him, trying to scam some more victims.
There are also these other PNL cards with alleged high limits:
https://bitcointalk.org/index.php?topic=591558.0But this second seller also don't have any feedback on those cards.
I'll believe them, when I see a link about them on a banking site or at least some credible reviews.