Returning Maze's End to its owner's hand is part of the cost to activate its last ability. Once that ability is announced, players can't respond to it until after you've paid its activation cost and returned Maze's End to hand.
Maze's End
Putting a Gate onto the battlefield with Maze's End doesn't count as the one land you can play during your turn. If it's your turn, you can play Maze's End or a different land card from your hand after its ability has resolved.
Controlling multiple Gates with the same name has no effect on your ability to win the game with Maze's End. The excess Gates are simply ignored.
Magic: The Gathering · ™ & © Wizards of the Coast · Illus. Natalie Andrewson
Card data via Scryfall. Rarix is fan-made; not endorsed by the rights holders.
