16 cards where the set is “ori” and the cards are exclusive to a Starter deck

Aegis Angel (Magic Origins #273)
Divine Verdict (Magic Origins #274)
Eagle of the Watch (Magic Origins #275)
Serra Angel (Magic Origins #276)
Into the Void (Magic Origins #277)
Mahamoti Djinn (Magic Origins #278)
Weave Fate (Magic Origins #279)
Flesh to Dust (Magic Origins #280)
Mind Rot (Magic Origins #281)
Nightmare (Magic Origins #282)
Sengir Vampire (Magic Origins #283)
Fiery Hellhound (Magic Origins #284)
Shivan Dragon (Magic Origins #285)
Plummet (Magic Origins #286)
Prized Unicorn (Magic Origins #287)
Terra Stomper (Magic Origins #288)

Though this query has ended, its relics still slumber in New Argive.