Eternalize

Eternalize is a keyword ability introduced in Hour of Devastation. Eternalize is centered in white and blue, but shows up once in each of the other colors. Storywise, the mechanic is linked to the Eternals, Bolas's army of Zombie Warriors, mummified through the use of lazotep.

Description
The eternalize ability only can be activated if the creature is in your graveyard. When activated, the card is exiled but it creates a token copy of that creature. Moreover, this creature token has four changes: its power and toughness becomes 4/4, it has no mana cost, it is a zombie in addition to its other creature types, and it becomes a monocolored black creature. The Hour of Devastation set features a token card for each creature card with eternalize to emphasize the flavor of the Eternals. These supplements are not required to play with cards with eternalize; you can use the same items to represent an eternalized token as you would any other token. For easy play, extra "eternalized" markers were provided on punch cards.

Eternalize is an evolved Embalm. Many eternalized creatures have abilities that get better because of their increased power. However, the mechanic proved a better plot device than as a step forward for Embalm; with its narrow designs, worse popularity, and significant infrastructural requirements, it landed an 8 on the Storm Scale.

Eternalize made a reappearance in Modern Horizons 2, on two well-known cards that have "eternal" in their names. In this set, it features the first creature to be eternalized with smaller stats than the original.

Rulings

 * 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.
 * The token is a Zombie in addition to its other types and is black instead of its other colors. It has no mana cost, and thus its converted mana cost is 0. These are copiable values of the token that other effects may copy.
 * If the card copied by the token had any "when [this permanent] enters the battlefield" abilities, then the token also has those abilities and will trigger them when it's created. Similarly, any "as [this permanent] enters the battlefield" or "[this permanent] enters the battlefield with" abilities that the token has copied will also work.