Oketra's Attendant

• WOTC Official Reminder Textofficial rules
  Cycling — Cycling [cost] (Pay [cost], discard this card: Draw a card.)
• WOTC Official Reminder Textofficial rules
  Embalm — Embalm [cost] ([cost], Exile this card from your graveyard: Create a token that's a copy of it, except it's a white Zombie [type] with no mana cost. Embalm only as a sorcery.)

• WWizards of the Coast2017-04-18
  Official Ruling
  For each card with embalm, a corresponding game play supplement token can be found in some Amonkhet booster packs. These supplements are not required to play with cards with embalm; you can use the same items to represent an embalmed token as you would any other token.
• WWizards of the Coast2017-04-18
  Official Ruling
  The token copies exactly what was printed on the original card and nothing else. It doesn't copy any information about the object the card was before it was put into your graveyard.
• WWizards of the Coast2017-04-18
  Official Ruling
  The token is a Zombie in addition to its other types and is white instead of its other colors. It has no mana cost, and thus its mana value is 0. These are copiable values of the token that other effects may copy.
• WWizards of the Coast2017-07-14
  Official Ruling
  Once you've activated an embalm ability, the card is immediately exiled. Opponents can't try to stop the ability by exiling the card with an effect such as that of Crook of Condemnation.
• WWizards of the Coast2017-07-14
  Official Ruling
  If a spell or ability puts a creature card with embalm into your graveyard during your main phase, you'll have priority immediately after that spell or ability resolves. You can activate the creature card's embalm ability before any player can exile it with an effect, such as that of Crook of Condemnation, if it's legal for you to do so.

Rulings via Scryfall