The owner of this deck hasn't added a sideboard, they probably should...
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Easy, simple, probable. You may have to mulligan once or thrice. It exiles all but 1 card and wins by the next turn unless it's stopped.
Start the game with Endless Horizons in your hand. That might mean a few mulligans, but since you only need 4 plains by turn 4 to cast it, chances are you'll be fine. Once it's cast, exile everything but the Maniac. The next turn, play Prairie Stream to cast your last drawn card- the Maniac. If nothing was done about either permanent, you will win the game the following turn. :)
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