At the beginning of each upkeep, you may exile target creature card from your graveyard
Pairing this with cantrips (cards that replace themselves and usually offer some form of card selection) allows you to both quickly fill your graveyard for cards like Murktide Regent or Underworld Breach and make sure that you are drawing good cards every turn
Choosing the best MTG Lord of the Rings commanders is a tall order
Your curve is bloated at four, five, and six
Azlask, the Swelling Scourge Brisela, Voice of Nightmares Emrakul, the Aeons Torn Emrakul, the Promised End Emrakul, the World Anew Hanweir, the Writhing Township Herigast, Erupting Nullkite Kozilek, Butcher of Truth Kozilek, the Broken Reality Kozilek, the Great Distortion Ulalek, Fused Atrocity Ulamog, the Ceaseless Hunger Ulamog, the Defiler Ulamog, the Infinite Gyre Zhulodok, Void Gorger
I hope they help