Each copy targets a different one of those creatures

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It increases the cost of your opponents artifact, instant, and sorcery spells, which stalls fast combo or spell-based decks
Other than that, theres no unique identifier on the cards that tell you theyre promos
Ultimately, Lorcana will have to both become a collectors item and convince players of its competitive potential if its going to coexist with other mainstays in the TCG space
Ask yourself, What do I want this deck to do