Sefris, Dungeon Speed-Runner v1.1.MKM (EDH / Commander)

'Sefris of the Hidden Ways' leverages a creature heavy, Dungeon pay-off value engine with 'Radiant Solar' as a capable lieutenant. Emphasis with the creatures lies in the ability to move to and from the graveyard without additional tools, satisfying Sefris requirment and providing additional value. Bringer of the Last Gift, Sheoldred // The True Scriptures and Breach the Multiverse all provide potential win-cons.

Protection/Removal + triggers

Glen Elendra Archmage
Angel of the Ruins
Sheoldred // The True Scriptures
Bringer of the Last Gift
Werefox Bodyguard
Archfiend of Ifnir
Chupacabra Echo
Dakkon, Shadow Slayer
Confounding Riddle
Wail of the Forgotten
Malakir Rebirth // Malakir Mire
Gift of Immortality
Solitude
Soul Enervation

Cycling/Looting/Mill/Surveil/Recursion triggers

Angel of the Ruins
Barrowin of Clan Undurr
Scion of Darkness
Archfiend of Ifnir
Splendor Mare
Curator of Mysteries
Street Wraith
Tortured Existence
Matzalantli, the Great Door // The Core
Palantír of Orthanc
Network Terminal
Dakkon, Shadow Slayer
Confounding Riddle
Frantic Search
Millikin
Likeness Looter
Cruel Somnophage // Can't Wake Up
Master of Death
Syr Konrad, the Grim
Malcolm, Alluring Scoundrel
The Ancient One
Shadow Kin
Shadowy Backstreet
Undercity Sewers
Meticulous Archive

Draw/Tutor + triggers

Mulldrifter
Entomb

Initiative/Venture triggers

Radiant Solar
Triumphant Adventurer
Barrowin of Clan Undurr
Midnight Pathlighter
Nadaar, Selfless Paladin
Immovable Rod
Rilsa Rael, Kingpin
Acererak the Archlich
Tomb of Horrors Adventurer
White Plume Adventurer
Sarevok's Tome

Notes

Sakashima the Impostor - clone Sefris for double triggers.
Archfiend of Ifnir - Plays into cycle/discard theme to wither opponents creatures.
Master of Death - reusable graveyard trigger, self-recur to hand.
Dakkon, Shadow Slayer - +1 surveil2 for grave trigger, -3 for removal.
Vanish into Memory - temporary removal + draw or protection + ETB trigger on your own creature, then discard (grave trigger).
Tortured Existence - discard creature card to grave + recur another creature to hand: 1 mana dungeon trigger on loop each turn w/ Sefris.
Phyrexian Tower - sac (+grave trigger) for ramp.
Riptide Laboratory - bounce wizards (Sefris) to hand for protection and ETBs.
Gift of Immortality - protect Sefris in theme or any creature for recurring grave + ETB/LTB triggers.
Strionic Resonator - Copy triggered ability for 2 (double up Sefris abilities + others)
Bartolomé del Presidio - Free sac outlet
Doom Weaver - Fat pay-off in card draw for sac'ing.
Eriette's Tempting Apple - Take an opponents creature to use and sac (note, this will not trigger Sefris as it will go directly to owner's graveyard.
Soul Enervation - Takes advantage of graveyard fluidity in this build.

Interesting cards not in the current build:

Benevolent Bodyguard - sac for protection, goes to grave.
Overcharged Amalgam - exploit to counter, grave trigger.
Ravenloft Adventurer - ETB initiative. Exile opponents creatures instead of graveyard, deal damage for each.
Yuan-Ti Malison - Dungeon trigger on combat damage to opponent.
Sidisi, Undead Vizier - opt to sac a creature ETB, tutor a card to hand.
Morbid Opportunist - draws 1 card per turn for any other creature death.
Grim Haruspex - draws 1 card per your non-token creature death.
Corpse Connoisseur - tutor to grave ETB, self-recur via unearth.
Wispmare - removal ETB, evoke to grave.
Doomed Necromancer - sac, recur to 'field --> goes to grave.
Obsessive Stitcher - sac, recur to 'field --> goes to grave.
Athreos, God of Passage - creatures upon grave --> recur to hand.
Liesa, Forgotten Archangel - creatures upon grave --> recur to hand.
Priest of Fell Rites - sac to grave, self-recur via unearth
Luminous Broodmoth - re-cur non-flying creatures upon grave.
Attrition - Sac a creature to remove a non-black creature.
Hostile Hostel // Creeping Inn - sac (+grave trigger) for flip-side finisher.
Forbidden Alchemy - look at top 4 from library, keep 1, 3 to grave.
Siren Stormtamer - sac to counter, goes to grave.
Phyrexian Reclamation - Return (cycling) creatures to hand.
Oversold Cemetery - Return (cycling) creatures to hand.
Thorough Investigation - sac clue token: venture
Drift of Phantasms - Transmute to graveyard, tutor.
Dimir House Guard - Transmute to graveyard, tutor.
Solitude - removal ETB, evoke to grave.
Plaguecrafter - sac ETB --> to grave
Horror of the Broken Lands
Undead Gladiator