It comes bundled with protection from the two most important removal colors in the format, and it also gains you some life on the side
For example, the new Professor Sada is so fitting for Lugia since Archeops has a very ancient, prehistoric vibe but Professor Oak seems better for a Blastoise deck, wouldnt you agree
While Dark-types are notably weaker, in terms of coverage they are always chosen over Ghost-types due to their ability to hit Normal-types and being resistant to themselves, unlike Ghost-types
And fourth, we want to make cards that present a challenge to players so that a select few will rise to that challenge
Collectors do not just buy these cards for their market value or investment potential
Rin and Seri's activated ability pings opponents and gains you life, and with enough creatures on board it becomes a serious threat