I mean, I love the art on Roselia, and the green foil is quite attractive
Persist (When this creature dies, if it had no -1/-1 counters on it, return it to the battlefield under its owner's control with a -1/-1 counter on it.) If the target creature is an illegal target as Persistent Constrictor's first ability tries to resolve, it won't resolve and none of its effects will happen
From a competitive standpoint, not many of these see much play, although Ketramose, the New Dawn is the face of a hot new Modern combo deck
With pokemon card prices in particular, some of the rarest cards (like that aforementioned pikachu illustrator card) have been sold for upwards of 100,000$
Secondly, while declaring blockers, if one creature in a band becomes blocked, the whole band does as well (702.21h)