The creature's design is this strange, somewhat-phallic ethereal figure with six eyes and a huge grin coming out of a dead-eyed woman's forehead
There are wholesome ways to use Helm of the Host like copying a Nadaar, Selfless Paladin to help venture through a dungeon quicker but it's also a potent combo tool
2 Doorkeeper Thrull No More ETBs Enter the battlefield triggers are some of those annoying things that your opponents try to do that always seem to mess your game up
Solid inclusion in any black deck
Sometimes, though, White has a couple options that can hit both artifacts and enchantments as well, such as Loran of the Third Path or Rambunctious Mutt, but they're far less universal by way of comparison
If they have Gix, you want to save removal for that, but otherwise spend your removal freely (yes, even on Spyglass Siren)