It's our most popular card type, and it has the smallest amount of design space, so I've made sure that we carefully use up the majority of all the existing planeswalker design space before opening up new veins
If it had any other artifact subtypes (such as Equipment), it will retain those
There is no limitation to this, and the player can pick any villain character their opponent has in play and immediately banish them, meaning an extremely buffed-up villain can be done away with in a single action
Plays nicely in Princess shells that splash Sapphire
Additionally, whenever Umbris or another nightmare or horror enters the battlefield under its owner's control, target opponent exiles cards from the top of their library until they exile a land
That means playing cards like Doomed Dissenter over Raise the Alarm or Butcher Ghoul, Ministrant of Obligation over Weaponcraft Enthusiast etc