Non, le gatherer précise bien que si le Marais cesse d’être un Marais, l'enchantement sera mis dans le cimetière de son propriétaire.
Ô Saint Gatherer a écrit :
This card now has Enchant Swamp, which works exactly like any other Enchant ability. This means it can only be cast targeting a Swamp, and it will be put into its owner’s graveyard if the permanent it’s attached to ever stops being a Swamp.