We have PC that is able to target stacks but not normal perms in the form of earthquake(sorta), but seeing it go the other way around is new. Why is the unupgraded version restricted from targeting stacks, and why does gaining the ability to target stacks necessitate a cost increase? In most cases, targeting a pillar/pendulum or bone wall stack is considered a waste of a PC card; why increase the cost for something that is almost always considered a bad use? Alternatively, why should SoP and SoG not be targeted by the unupped version? It seems rather arbitrary that those two shards specifically are barred from interacting with this card for the sole reason that they stack.
Stacking aside, I like the card! The delay before being destroyed is interesting (no FG infesting your perm field with 12 of these, heh) and the possibility for chains of repeated PC-ing sounds like a pillar's worst nightmare! The thematic notion of random destructive shapes is also very fitting-- I can imagine swarms of these migrating in the wild void, approaching ancient ruins and absorbing them into their ranks.