Initial testing looks pretty solid. It wasn't difficult to keep Ojutai protected at all times, and he's excellent at both keeping you in the lead when you're in the lead, and at closing out the game. Getting +2 power from somewhere felt pretty crucial, though, since a 5-shot kill is pretty slow, and I think the deck might want more counterspells.
Anyway here's a deck built around him. Most it's voltron, but there's some stax shenanigans in there too. A bit bland but it's just a first attempt.
1 Dragonlord Ojutai
Voltron stuff (11)
1 lightning greaves
1 reconnaissance
1 angelic field marshal
1 umbral mantle
1 avarice amulet
1 fireshrieker
1 batterskull
1 umezawa's jitte
1 sword of feast and famine
1 sword of fire and ice
1 sword of vengeance
alternate voltrons (5)
1 daxos of meletis
1 augury adept
1 looter il-kor
1 lu xun, scholar general
1 thada adel, acquisitor
Wipes (6)
1 catastrophe
1 austere command
1 wrath of god
1 supreme verdict
1 cataclysm
1 comeuppance
counters (5)
1 Azorius Guildmage
1 forbid
1 arcane denial
1 mana drain
1 force of will
removal (10)
1 pongify
1 rapid hybridization
1 domineering will
1 cyclonic rift
1 capsize
1 oblation
1 swords to plowshares
1 return to dust
1 unexpectedly absent
1 path to exile
1 weathered wayfarer
1 expedition map
1 stoneforge mystic
1 enlightened tutor
1 steelshaper's gift
1 stonehewer giant
stax (10)
1 hushwing gryff
1 aven mindcensor
1 linvala, keeper of silence
1 magus of the moat
1 dream tides
1 land equilibrium
1 rest in peace
1 moat
1 static orb
1 torpor orb
ramp (10)
1 chrome mox
1 mana crypt
1 sol ring
1 mana vault
1 fellwar stone
1 azorius signet
1 talisman of progress
1 grim monolith
1 unstable obelisk
1 grand arbiter augustin IV
lands (36)
7 fetches
1 tundra
1 hallowed fountain
1 mystic gate
1 skycloud expanse
1 celestial colonnade
1 glacial fortress
1 temple of enlightenment
1 seachrome coast
1 adarkar wastes
1 command tower
1 tolaria west
1 reliquary tower
1 academy ruins
1 ancient tomb
1 strip mine
1 wasteland
1 buried ruin
1 kor haven
1 flagstones of trokair
1 gemstone caverns
1 hall of the bandit lord
1 cavern of souls
2 island
5 plains
EDH Primers
Phelddagrif - Zirilan
EDH
Thrasios+Bruse - Pang - Sasaya - Wydwen - Feather - Rona - Toshiro - Sylvia+Khorvath - Geth - QMarchesa - Firesong - Athreos - Arixmethes - Isperia - Etali - Silas+Sidar - Saskia - Virtus+Gorm - Kynaios - Naban - Aryel - Mizzix - Kazuul - Tymna+Kraum - Sidar+Tymna - Ayli - Gwendlyn - Phelddagrif 4 - Liliana - Kaervek - Phelddagrif 3 - Mairsil - Scarab - Child - Phenax - Shirei - Thada - Depala - Circu - Kytheon - GrenzoHR - Phelddagrif - Reyhan+Kraum - Toshiro - Varolz - Nin - Ojutai - Tasigur - Zedruu - Uril - Edric - Wort - Zurgo - Nahiri - Grenzo - Kozilek - Yisan - Ink-Treader - Yisan - Brago - Sidisi - Toshiro - Alexi - Sygg - Brimaz - Sek'Kuar - Marchesa - Vish Kal - Iroas - Phelddagrif - Ephara - Derevi - Glissa - Wanderer - Saffi - Melek - Xiahou Dun - Lazav - Lin Sivvi - Zirilan - Glissa
PDH - Drake - Graverobber - Izzet GM - Tallowisp - Symbiote Brawl - Feather - Ugin - Jace - Scarab - Angrath - Vraska - Kumena Oathbreaker - Wrenn&6
EDH Primers
Phelddagrif - Zirilan
EDH
Thrasios+Bruse - Pang - Sasaya - Wydwen - Feather - Rona - Toshiro - Sylvia+Khorvath - Geth - QMarchesa - Firesong - Athreos - Arixmethes - Isperia - Etali - Silas+Sidar - Saskia - Virtus+Gorm - Kynaios - Naban - Aryel - Mizzix - Kazuul - Tymna+Kraum - Sidar+Tymna - Ayli - Gwendlyn - Phelddagrif 4 - Liliana - Kaervek - Phelddagrif 3 - Mairsil - Scarab - Child - Phenax - Shirei - Thada - Depala - Circu - Kytheon - GrenzoHR - Phelddagrif - Reyhan+Kraum - Toshiro - Varolz - Nin - Ojutai - Tasigur - Zedruu - Uril - Edric - Wort - Zurgo - Nahiri - Grenzo - Kozilek - Yisan - Ink-Treader - Yisan - Brago - Sidisi - Toshiro - Alexi - Sygg - Brimaz - Sek'Kuar - Marchesa - Vish Kal - Iroas - Phelddagrif - Ephara - Derevi - Glissa - Wanderer - Saffi - Melek - Xiahou Dun - Lazav - Lin Sivvi - Zirilan - Glissa
PDH - Drake - Graverobber - Izzet GM - Tallowisp - Symbiote Brawl - Feather - Ugin - Jace - Scarab - Angrath - Vraska - Kumena Oathbreaker - Wrenn&6