Odd-Eyes Arcray Dragon — Ruling

Regola generale

About the『this card is always treated as "Supreme King Z-ARC"』text:
This is not an effect. (Even if this card's effects are negated, it is still treated as "Supreme King Z-ARC".)
This card's name is treated as "Supreme King Z-ARC". It is not treated as "Odd-Eyes Arcray Dragon". (It is not an "Odd-Eyes" card.)
You can only use up to 3 copies of Supreme King Z-ARC and/or Odd-Eyes Arcray Dragon, combined, while building your Deck.

About the『this face-down card in the Extra Deck must first be either Fusion Summoned, or Special Summoned by Tributing 1 Level 12 DARK "Supreme King Z-ARC"』text:
This is not an effect. This is the summoning procedure for Special Summoning this monster from the face-down Extra Deck.
Due to this text, this monster in your face-down Extra Deck can only be Special Summoned using the listed methods, generally. However, you can also Special Summon it from the face-down Extra Deck using an effect that『ignores the Summoning Conditions.]]
Both Fusion Summoning this card, and Special Summoning it by Tributing Supreme King Z-ARC, are proper methods of Special Summoning this card.
If you Special Summon this card by Tributing Supreme King Z-ARC, Tributing Supreme King Z-ARC and Special Summoning this card are not treated as having happened simultaneously.
You can also Special Summon this card by Tributing a Supreme King Z-ARC in face-down Defense Position.

This effect is a Trigger Effect.
If this card in the Monster Zone is destroyed and sent to the Graveyard as a result, the effect can be activated in the Graveyard. If this card is banished face-up as a result of being destroyed, instead, it can be activated while banished. If it is added to the Extra Deck face-up instead, it will be activated while in the face-up Extra Deck.
This effect can only be activated while you have a Pendulum Zone available.