Historical Rules · 5 October 2018
Rule 702.127a
Official source text from the 5 October 2018 Rules release
Embalm is an activated ability that functions while the card with embalm is in a graveyard. “Embalm [cost]” means “[Cost], Exile this card from your graveyard: Create a token that’s a copy of this card, except it’s white, it has no mana cost, and it’s a Zombie in addition to its other types. Activate this ability only any time you could cast a sorcery.”