Here is my first draft for a King of Oathbreaker's EDH deck with a focus on Tokens and some lockout using some cardsI have on hand.
Commander:
1 King of the Oathbreakers
Creatures (20):
1 Clarion Spirit
1 Hanged Executioner
1 Mirror Entity
1 Selfless Spirit
1 Kami of False Hope
1 Twilight Drover
1 Thalisse, Reverent Medium
1 Windborn Muse
1 Katilda, Dawnhart Martyr
1 Drogskol Cavalry
1 Drogskol Reinforcements
1 Angel of Flight Alabaster
1 Horobi, Death's Wail
1 Opposition Agent
1 Mirkwood Bats
1 Grey Host Reinforcements
1 Skyclave Apparition
1 Remorseful Cleric
1 Bygone Bishop
1 Guardian of Faith
Instants (11):
1 Swords to Plowshares
1 Path to Exile
1 Anguished Unmaking
1 Kaya's Guile
1 Benevolent Offering
1 Cauldron Haze
1 Eerie Interlude
1 Scapegoat
1 Embolden
1 Release to Memory
1 Plumb the Forbidden
Sorceries (8):
1 Austere Command
1 Hour of Reckoning
1 Kirtar's Wrath
1 Lingering Souls
1 Spectral Procession
1 Storm of Souls
1 Shadow Summoning[Expand Post] 1 Patriarch's Bidding
Artifacts (11):
1 Sol Ring
1 Arcane Signet
1 Orzhov Signet
1 Talisman of Hierarchy
1 Mind Stone
1 Fellwar Stone
1 Skullclamp
1 Long-Forgotten Gohei
1 Staff of the Storyteller
1 Oketra's Monument
1 Golden Argosy
Enchantments (11):
1 Blind Obedience
1 Ghostly Prison
1 Ethereal Absolution
1 Field of Souls
1 Haunted Library
1 Promise of Bunrei
1 Intangible Virtue
1 Etchings of the Chosen
1 Spirit Bonds
1 Inspiring Leader
1 Bastion of Remembrance
Planeswalker (1):
1 Kaya, Geist Hunter
Lands (37):
1 Command Tower
1 Path of Ancestry
1 Orzhov Basilica
1 Caves of Koilos
1 Isolated Chapel
1 Shattered Sanctum
1 Tainted Field
1 Temple of Silence
1 Scoured Barrens
1 Sunlit Marsh
1 Unclaimed Territory
1 Vault of the Archangel
1 Bojuka Bog
1 Shineshadow Snarl
1 Myriad Landscape
1 Evolving Wilds
1 Terramorphic Expanse
13 Plains
7 Swamp