"Memento" cards missing from Card Collection

Hi, I'm trying to add a few cards from the Valiant Smashers set to my collection, but they're not showing up - specifically, all of the Memento cards (except for "Mementotlan Dark Blade") and "Call of the Haunted" are not showing up when I search them out.

And also, "Concours de Cuisine (Culinary Confrontation)" from Age of Overlord isn't searchable in the Collection either - just figured I'd bring that one up while I'm writing this.