Historical Rules · 13 October 2023
Rule 702.129a
Official source text from the 13 October 2023 Rules release
Eternalize is an activated ability that functions while the card with eternalize is in a graveyard. “Eternalize [cost]” means “[Cost], Exile this card from your graveyard: Create a token that’s a copy of this card, except it’s black, it’s 4/4, it has no mana cost, and it’s a Zombie in addition to its other types. Activate only as a sorcery.”