It seems that these numbers will be used to challenge other characters and not to attack your opponents life total like in Magic: the Gathering
What happens if you strip away a summons abilitiesor all its lore counters
However, the promo card will only be available while stocks last, although a standard edition of the card will appear in a future set
And I think Mirror Chamber could be a very good location for control decks

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Each starter deck includes: 1 Preconstructed deck of 60 cards, including 2 foil cards of the characters on the package front 11 Game tokens 1 Quick Start Rulebook 1 Booster pack containing 12 randomized cards AMETHYST & RUBY DECK This deck features mysterious Amethyst characters who can harness magical powers to help you achieve your goals, with the action-oriented boldness of Ruby characters, who dash forward with speed and bravery