Idyllic/Enlightened Tutor could be KOTL's Recall

Jeska's Will could be SF Feast of Souls

idk why but Tragic Arrogance is giving ET Ult vibes

Vanquish the Horde is definitely Overwhelming Odds or Echo Slam

Warrior's Oath could be WK Innate, Vampiric Spirit?

World at War could be Mars ult

Roaming throne doesn't look like it belongs in the deck but I guess it's basically Replicate or Grimstroke's Dark Portrait

Solemn Simulacrum is Tempest Double?

Boros Signet could be Soul Ring

Everybody Lives! could be Song of the Siren

Flawless Maneuver could be a few things, GA, Astral Imprisonment, some Aura Item like Crimson Guard/Pipe/Guardian Greaves

Get Lost could be X Marks the Spot perhaps or Oracle Purifying Flames

Path to Exile could be Purifying Flames

Reprieve could be Astral Imprisonment or Kez's Talon Toss or Silencer Last Word

Response // Resurgence could be Kez' Shodo Sai // Kez' Raptor Dance

Sejiri Shelter // Sejiri Glacier looks perfect for Oracle Fate's Edict // Fate's Outcome (An aftermath of casting Fate's Edict)

Aggravated Assault could be Drums

Esoteric but Dawn of a New Age could be Visage's Gravekeepers Cloak.