The simplest format for a list of Magic cards is a text file containing the number of copies you own and the name of a card on a line by itself: 2x Mimic 1x Mordenkainen's Polymorph 2x Ray of Frost 4x Sol Ring However, the application supports many formats, including a CSV from Magic: The Gathering Online, TCGPlayer table, MTG Studio, Apprentice, DeckBox, and more
The three fast-mana cards are available in relatively low numbers and are extremely powerful in casual and competitive MTG Commander
Notably, if Inalla is on the battlefield and its eminence ability triggers, but it's put into the command zone before that ability resolves, that ability won't do anything as it resolves
They're the card's age, condition, artwork, and availability
Combine it with cards like Ingenuity Engine, Extruder, Deretti Scrap Savant or Arcbound Ravager and it'd be a grisly inclusion into any artifact-heavy setup
That is the difference between a card business built on verified demand and one built on guessing