Your search for "Irregular Cohort 015/254" revealed the following:
Officer (015) // Illusion Token (TTRK) from Star Trek, available at 401 Games Canada. Rarity: Token Finish: Normal Artist: Carlos Dattoli & Flavio Greco Paglia
Officer (015) // Illusion Token (Foil) (TTRK) from Star Trek, available at 401 Games Canada. Rarity: Token Finish: Foil Artist: Carlos Dattoli & Flavio Greco Paglia
Irregular Cohort (Foil) (MH1) from Modern Horizons, available at 401 Games Canada. Rarity: Common Finish: Foil Artist: Steve Argyle Card Text:Changeling (This card is every creature type.)When Irregular Cohort enters the battlefield, create a 2/2 colorless Shapeshifter creature token with...