Beyond the obvious marketing strategy aimed at boosting sales for the deck, which primarily consists of reprints of older OP-02 Paramount War cards, these tournaments also provide a chance for new players to engage in competitions on relatively equal footing with veteran players
Needless to say, that's not too big a difference for spellslinger decks
With enough resources, additional searching/swarming power can be pivoted to "Rangbali" and "Arvata" for negates, "Circle of the Fire Kings" for revival, "Fire King Sky Burn" for removal, or Extra Deck monsters for more board presence
It also cannot be destroyed by Card Effects from Monsters of the same type
In the right decks, this can double, triple or even quadruple your mana depending on how many other players there are