Cast Boundless Realms by paying {6}{G}, causing you to search your library for a number of Gate cards equal to the number of lands you control, and put them onto the battlefield tapped.
Activate Maze's End's second ability by paying {3}, tapping it and returning it from the battlefield to your hand, searching your library for a Gate, putting it onto the battlefield and causing you to win the game.

Win the game

Rootpath Purifier

Maze's End

Boundless Realms

Cast New Frontiers by paying {9}{G} minus {1} for each unqiue Gate you control.
Resolve New Frontiers, causing you to search your library for that many Gate cards and put them onto the battlefield tapped, and allowing each opponent to do the same for basic lands.
Activate Maze's End's second ability by paying {3}, tapping it and returning it from the battlefield to your hand, searching your library for a Gate, putting it onto the battlefield and causing you to win the game.

Search Results