Cards like Kyodai, Soul of Kamigawa or Behold the Unspeakable
Though it might take a while to get going, the back-n-forth nature of Commander sees multiple creatures hit the graveyard each combat cycle, and with Draugr Necromancer on your side, you not only deny these fallen creatures access to their owner's graveyard, but also get the chance to bring them aboard your team
Eshki, Temur's Roar is a satisfying commander without typal restrictions, letting you run it in all manner of battlecruiser decks
Enter Riverchurn Monument, the missing piece in that puzzle that allows you to win instantly by comboing with a Traumatize effect
Getting one at instant speed, along with some damage on top to surprise opponents, is even better
Foil Discard Filler with Hologram (row 10) and Foil Discard Fillers with No Hologram (row 11) from Foil Rare Modern Masters 2015 uncut sheet