8 cards where the set is “m19” and the cards are exclusive to a Starter deck

Air Elemental (Core Set 2019 #308)
Befuddle (Core Set 2019 #309)
Grasping Scoundrel (Core Set 2019 #312)
Llanowar Elves (Core Set 2019 #314)
Mist-Cloaked Herald (Core Set 2019 #310)
Radiating Lightning (Core Set 2019 #313)
Sun Sentinel (Core Set 2019 #307)
Waterknot (Core Set 2019 #311)

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