List of Key Cards

The five lands I mentioned are auto-includes for their utility
Gavony Township
Ghost Quarter
Mystifying Maze
Tectonic Edge
Temple of the False God

Removal and the like is always important to run:
Swords to Plowshares
Afterlife
Condemn
Nature's Claim
Oblation
Selesnya Charm
Sundering Growth
Trostani's Judgement
Spine
Acidic Spine
Reclamation Sage
Lignify
Oblivion Ring
Song of Dryads

Recursion:
Rally the Ancestors
Eternal Witness
Karmic Guide
Marshal's Anthem

Powerful Token generators:
White Sun's Zenith
Avenger of Zendikar
Emeria Angel
Geist-Honored Monk
Giant Adephage
Heloid, God of the Sun
Rampaging Baloths
Hornet Queen
Scion of Vitu-Ghazi
Tolsimir Wolfblood
Twilight Drover
Viti-Ghazi Guildmage
Wayfaring Temple
Trostani Summoner

Non-Token Generating Creatures that are just bonkers:
Angel of Serenity
Banisher Priest
Containment Priest
Emma Tandris
Flickerwisp
Geist-Honored Monk
Grand Abolisher
Laminate Primordial


Anthems:
Angel of Jubilation
Archangel of Thune
Mikaeus, the Lunarch
Phantom General
Gavony Township
Will-Leaf Liege
Collective Blessing
Growing Ranks
Intangible Virtue
Leyland of the Meek
Parallel Lives
Marshal's Anthem
True Conviction
Unflinching Courage
Wolfcaller's Howl
Spear of Heloid

Win conditions:
Kamahl, Fist of Krosa
Desert Twister
Overrun
Hour of Reckoning
Overwhelming Stampede
Martial Coup
Mirror Entity
Sun Titan
Glare of Subdual
Karmic Justic
Devout Invocation

Ramp: It's EDH, you're going to need mana and tons of it
Sol Ring
Caged Sun
Expedition map
Selsenya Signit
Thran Dynamo
Worn Powerstone
Burnished Hart
Solemn Simulacrum
Explosive Vegation
Search for Tomorrow
Rampant Growth
Courser of Kruphix
Sakura Tribe Elder
Yavimaya Elder