Vilis, Broker of Blood gives you the chance to draw a ton of cards, remove your opponents creatures, and even gain life
Want to try it for yourself
Then again, the effect isnt that powerful for the cost, so budding Planeswalkers with limited deck space might want to pack some cheaper creature removal than Sephiroth.
True, replaying the adventure again and again does give you lots of Y'shtola triggers, but it has me wondering whether there's a token subtheme to the deck, or if Hildibrand's ability is only meant to buff his own zombies
If you sacrifice it, you get to destroy an artifact, enchantment, or even proliferate, making it an excellent choice for counter-based decks
Here there's basically one way: put it under an Oblivion Ring and then cast Apocalypse