Kill most of their deck and win

, Sacrifice this land: Search your library for a basic land card, put it onto the battlefield tapped, then shuffle.

Target player mills half their library, rounded down.

Copy target instant or sorcery spell. You may choose new targets for the copy.

+2: Each player draws a card. −1: Target player draws a card. −10: Target player mills twenty cards.

Landfall — Whenever a land you control enters, target player mills three cards. (They put the top three cards of their library into their graveyard.)