Don't underestimate Final Fantasy players though
Magic: The Gathering FINAL FANTASY Commander (FIC) and FINAL FANTASY Through the Ages (FCA) are Commander-, Legacy-, and Vintage-legal sets, and individual cards are also legal where already available in other formats
That seems to be just for flavor, and summon doesn't have any impact on the rules that we know of
This is remarkable given that starter decks alone typically cost around $17 each, and the new set will include two of them as well as a game board, character standees, and more
Ultimately, this is a placeholder solution so that more time can be spent on fingerprinting and identifying headless browsers (EG: via how they do font rendering) so that the challenge proof of work page doesn't need to be presented to users that are much more likely to be legitimate
To determine the total cost of a spell, start with the mana cost or alternative cost you're paying (such as a flashback cost), add any cost increases (such as kicker costs), then apply any cost reductions (such as that of The Wind Crystal's first ability)