Another OTK can be accomplished using Stoic Challenge on "Number 39: Utopia Beyond", who, if summoned by using "Rank-Up-Magic Astral Force" on a "Utopia Ray" with 3 XYZ materials, will be able to attack one monster for double the damage (total of 10800 damage) . As any monsters your opponent controls will have 0 ATK due to the Summoning effect of "Utopia Beyond", you will almost certainly be able to wipe out your opponent.
"Maestroke" could also be used to protect any of the "Djinn" Xyz Monsters.
You can combine this card with "Tiras, Keeper of Genesis" to do extra damage, destroy a card and still keep "Tiras" on the Field after your opponent's End Phase.
Summon any "Constellar" Xyz monster, and then, Xyz Summon "Constellar Ptolemy M7", and again, Xyz Summon "Gaia Dragon, the Thunder Charger". Equip this card to it, giving it 5000 ATK, which will inflict double piercing damage.
Another option is to equip this card to a "Constellar" Xyz Monster and attack, then Summon "Ptolemy M7" to avoid this card's destruction Effect and keep your monster.
You can equip this card to a "Number" while "Number Wall" is on the Field to prevent your monster from being destroyed after your opponent's End Phase.