A noncreature permanent that turns into a creature can attack, and its {T} abilities can be activated, only if its controller has continuously controlled that permanent since the beginning of their most recent turn. It doesn't matter how long the permanent has been a creature.
The lands are both lands and creatures at the same time. They are affected by anything that affects either permanent type.
It affects Swamps controlled by any and all players.
Magic: The Gathering · ™ & © Wizards of the Coast · Illus. Christopher Rush
Card data via Scryfall. Rarix is fan-made; not endorsed by the rights holders.
