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Trample
When Argothian Wurm enters, any player may sacrifice a land of their choice. If a player does, put Argothian Wurm on top of its owner's library.
When Argothian Wurm enters, first the active player gets the option to sacrifice a land. If they decline, the next player in turn order gets the option. If a player elects to sacrifice a land, Argothian Wurm is put on top of its owner's library, but then all remaining players still get the option. If all players decline, then nothing happens and Argothian Wurm stays on the battlefield.