changes I would make to the Z-ARC Supreme King archetype

To start we need a level 13 / Divine Demon Dragon / monster with its effects from the anime, then the Z-ARC fusion should be renamed Supreme King Z-ARC - Fusion Universe and have "Supreme King Dragon Starving Venom" and "Supreme King Z-ARC" in its illustration as well as Supreme King Z-ARC - Synchro Universe has "Supreme King Dragon Clear Wing" and "Supreme King Z-ARC" and obviously also a Rank 12 Supreme King Z-ARC - XYZ Universe with "Supreme King Dragon Dark Rebellion" and "Supreme King Z-ARC" in his illustration , possibly also a Supreme King Z-ARC - Pendulum Universe that would have the demonic version of Yuya and Supreme King Dragon Odd-Eyes in its illustration, all eyes would have similar effects but each one would be better or worse in different aspects

Its invocation conditions would be the following:

Fusion Universe 4 Dragon monsters (1 Fusion, 1 Synchro, 1 Xyz, and 1 Pendulum)
Must be Fusion Summoned.

Synchro Universe  1 Dark Tuner + 1+ non-Tuner Pendulum Monsters

Must be Synchro Summoned.

Supreme King Z-ARC - XYZ Universe 2 Level 12 Z-ARC Monsters

Must be XYZ Summoned.

Supreme King Z-ARC - Pendulum Universe Level 12

Must be Pendulum Summoned.

and finally let's make some adjustments to the 2 strongest versions of Zarc

[ Odd-Eyes Arcray Dragon - the Supreme King Celestial Dragon]

Attribute LIGHT / Level 13 / Pendulum Scale 13

< If you have 2 cards in your Pendulum Zones: You can Special Summon this card ignoring its summon conditions, and then you can apply this effect.
●Shuffle 1 card from your Pendulum Zone into the Deck and then, if it was added to your Extra Deck, you can Special Summon it, ignoring its Summon conditions. You can only use this effect of "Odd-Eyes Arcray Dragon" once per turn.>

[ Divine Heavenly Dragon / Pendulum / Effect ]

(1) This card is always treated as a Fusion, Synchro, and Xyz Monster, and has a Rank equal to its Level.

(2) Must be Special Summoned with "Chronograph Sorcerer", and cannot be Special Summoned by other ways. If this card is Special Summoned: You can destroy as many Spell or Trap cards your opponent controls as possible, then you gain Lp equal to the number of cards destroyed by 400 , This card cannot attack the turn you activated this effect.

(3) While there is a Pendulum Monster(s) banished and/or in either player's Graveyard: this card cannot be destroyed, also it is unaffected by card effects that would make it leave the field and All monsters you control are unaffected by the effects of your opponent's Pendulum Monsters.

(4) If this card destroys an opponent's monster by battle: You can Special Summon up to 2 "Supreme King Dragon" monsters from your Hand in attack Position.

(5) If your opponent adds a card(s) to the hand (except during the Draw Phase): You can add the same number of cards to your hand.

[ Supreme King Dragon Z-ARC ]

Attribute DARK / Level 13 / Pendulum Scale 0

<You can Tribute 2 "Supreme King" monsters; Special Summon this card from your Pendulum Zone, ignoring its Summoning conditions. and then you can apply this effect. ●Shuffle 1 pendulum card from your Hand into the Deck and then, if it was added to your Extra Deck, you can Special Summon it, ignoring its Summon conditions. You can only use this effect of "Supreme King Dragon Z-ARC" once per turn.>

[ Divine Demon Dragon / Pendulum / Effect ]

(1) (This card is also always treated as a Fusion, Synchro, and Xyz Monster, and has a Rank equal to its Level.)

(2) Must be Special Summoned with "Astrograph Sorcerer", and cannot be Special Summoned by other ways. If this card is Special Summoned: You can destroy as many monsters your opponent controls as possible, then each player that had a monster(s) destroyed by this effect takes damage equal to the total ATK the destroyed monsters had on the field ,This card cannot attack the turn this effect is activated.

(3) While there are Fusion, Synchro, and Xyz Monsters banished and/or in any Graveyard(s), this card cannot be destroyed, also unaffected by card effects that would make it leave the field and All monsters you control are unaffected by the effects of your opponent's Fusion, Synchro, and Xyz Monsters.

(4) If this card destroys an opponent's monster by battle: You can Special Summon up to 2 "Supreme King Dragon" monsters from your Extra Deck in Defense Position.

(5) If your opponent adds a card(s) to their hand (except during the Draw Phase): You can destroy that card(s).