Professor Primula’s Portfolio of Palaeontology, an upcoming third party supplement for DnD 5e and 2024, has something for both types of fan, combining real paleontological research with plenty of ...

A plausible reason why this card has been the first to spike, is that Tiamat is a DnD god, and so it’s unlikely to get a reprint (which would tank its value) in the upcoming universes-within MTG set.