Traven, Rebel Stitcher

Partner with Marvuel, Skaaberen's Bane. (When this creature enters the battlefield, target player may put Marvuel into their hand from their library, then shuffle.)
{x}{w}{u}{b}, {t}: Each player puts the top X cards
of their library into their graveyard.
"I was once a follower of Avacyn, but she no longer protects us. It is time to take matter into my own hands."