Random Numbers

Number 37: Eternal Machine King - Drakimera
DARK
Rank 8
Machine/Xyz/Effect
2 Level 8 Monsters
Once per turn: You can detach 1 Xyz Material from this card; Destroy 1 Spell or Trap card on the field. While this card has Xyz Material(s): This card cannot be targeted.
3000/1800

Number 66: Chaotic King - Weiss
LIGHT
Rank 4
Warrior/Xyz/Effect
3 Level 4 Monsters
When this card is Xyz Summoned and your opponent controls an Xyz Monster(S): Detach 1 Xyz Material from this card each of your opponent's Xyz Monsters. Once per turn: You can detach 1 Xyz Material from this card and target 1 face-up card on the field: Banish that card facedown. During the 2nd Standby Phase after this card's activation: Return that card to the field.
2450/2200

Number 81: Moonstone Mechanic
DARK
Rank 7
Spellcaster/Xyz/Effect
2 Level 7 Monsters
Once per turn: You can detach 1 Xyz Material from this card; Special Summon 1 Machine-Type monster from your Graveyard, but its ATK and DEF become 0, its effects are negated, and it cannot be used as material, except for the Xyz Summon of a Machine-type monster. If exactly 1 Machine-Type monster you control would be destroyed by a card effect: You can tribute that monster and destroy 1 card on the field.
2500/2100

Number 99: Red-Feathered Angel
WIND
Rank 9
Winged Beast/Xyz/Effect
2 level 9 Monsters
Once per turn, during either player's turn: You can detach 1 Xyz Material from this card; Place 1 card your opponent controls on top of their deck. Cards and effects cannot be activated in response to this effect.
2900/2500

Numbers are fun to make, given what breathes "life" into them.

Moonstone Mechanic seems interesting.
By any chance, could you lower its Rank to 4? O,o