Wolves. Produce a lot of tokens for Rhys 6-mana ability to double. Creatures that tend to go into graveyard should be big ones, so Haunted Fengraf will increasingly likely retrieve something big. Yeva_Elves_100 has first-dibs on any cards where there aren't enough. Design started by simply duplicating that. Commanders Yasharn, Emmara, Satsuki, Rhys, Dromoka, or Sigarda, would be suitable in place of Shanna.