As with the mechanically-unique Street Fighter cards we got a while back, existing outside of any set or precon deck has seemingly given the designers freedom to chase the most flavorful and cool mechanical design for each character
Ruination is a little meaner but falls into this category as well
Archazia also mentions that the Hexwell Crown is one half of a larger artifact, while also granting the team magical "coils" onto their Inkcasters that allow them to summon characters with dual ink affinities
Four mana, destroy all creatures, no scaling, life payment, or negotiation
How Many Un-Sets Are There in Magic
Draconic Destruction Sure, it used to be much, much cheaper, but Draconic Destruction is a great precon if youre into casting dragons and sending them at opponents