Wren

As someone who’s built and played the deck since Flubs got spoiled, he’s got nothing to worry about compared to Nadu. While still non-deterministic, Flubs has a downside that will eventually brick when you can’t immediately play the cards you draw whereas Nadu’s abilities are straight upside between the “card draw” or permanent ramp he builds. Even opponents interacting with it net the Nadu pilot value. Plus, Nadu was declared a genuine design mistake, so there’s that.