Yenna, Redtooth Regent

• WOTC Official Reminder Textofficial rules
  Scry — Look at the top N cards of your library, then put any number of them on the bottom of your library and the rest on top in any order.

• WWizards of the Coast2023-09-01
  Official Ruling
  Any enters-the-battlefield abilities of the copied enchantment will trigger when the token enters the battlefield. Any "as [this enchantment] enters the battlefield" or "[this enchantment] enters the battlefield with" abilities of the enchantment will also work.
• WWizards of the Coast2023-09-01
  Official Ruling
  If something becomes a copy of the token, the copy also isn't legendary.
• WWizards of the Coast2023-09-01
  Official Ruling
  Except for the listed exceptions, the token copies exactly what was printed on the original enchantment and nothing else (unless that enchantment is itself copying something else; see below). It doesn't copy whether that permanent is tapped or untapped, whether it has any counters on it or Auras attached to it, or any non-copy effects that have changed its power, toughness, types, color, and so on.
• WWizards of the Coast2023-09-01
  Official Ruling
  If the copied enchantment is copying something else, then the token enters the battlefield as whatever that creature copied, with the stated exceptions.
• WWizards of the Coast2023-09-01
  Official Ruling
  If the copied enchantment has in its mana cost, X is 0.

Rulings via Scryfall