If there is at least 1 Rank 9 monster, this card will have an astounding 10,000 ATK.
This card's first effect can be used to counter "Number S39: Utopia the Lightning", as it will have a minimum of 6000 ATK, exceeding the ATK modification effect of "Utopia the Lightning".
This card can be Special Summoned from the Graveyard infinitely with no restriction as long as you have no cards on the field or in your hand when your opponent declares a direct attack, so you don't need to worry about your opponent trying to attack during that time.
This card can be Summoned easily in a "Heraldic Beast" Deck. The various Xyz Monsters used by the archetype are all "Numbers", and can be revived easily with "Heraldic Beast Unicorn", allowing you to amass multiples of the same card to prepare for this card's Xyz Summon. Also, additional usage of "Unicorn" during later turns can revive more Xyz Monsters, indirectly increasing this card's ATK due to the corresponding increase in the total number of Ranks. Further, Number 69: Heraldry Crest can copy the name and effects of another Xyz on the field, including your own, allowing it to "Substitute" itself as a second copy of another number you control, so long as it was the same rank.