2018-01-19 : For more information on double-faced cards, see the Ixalan mechanics article (http://magic.wizards.com/en/articles/archive/feature/ixalan-mechanics).

2018-01-19 : If Journey to Eternity and the enchanted creature are both put into graveyards at the same time, Journey to Eternity’s ability will return both to the battlefield.

2018-01-19 : If Journey to Eternity enchants a creature you control but don’t own, the creature will return to the battlefield under your control from its owner’s graveyard when it dies. In a multiplayer game, if a player leaves the game, all cards that player owns leave as well. If you leave the game, any creatures you control from Journey to Eternity’s effect are exiled.

2018-01-19 : If another player gains control of the enchanted creature, Journey to Eternity will be put into your graveyard.