Spoilers below
So half the group has burned their fateshifters so far. Tyvar being able to transmute himself into the House seemed too good to be true, and it was.
I thought Jace would have come alone given that he can still planeswalk, bringing Vraska and Loot seems way too risky. They don't seem to want to make him seem likeable given that he just leaves Kaito to die. I wonder if Kaito will actually be able to planeswalk out of there or if the House truly is inescapable.
Also it's funny that Duskmourn seems to be afraid of Zendikar. Maybe opening a door to the Roil is dangerous to it? I would have expected maybe Innistrad, Tarkir or Ikoria to be riskier. Actually ,Duskmourn might like bringing in some of the horrors from Innistrad.