Notably, becoming basic also doesn’t grant any of the basic land types. If an effect instructs you to search your library for a basic land while you control Rootpath Purifier, you may search for any land card in your library. However, if an effect instructs you to search your library for a card with a basic land type, you must search for a land that is a Plains, Island, Swamp, Mountain, or Forest, regardless of whether or not the land is basic.