Rites of Spring 
Sorcery
Discard any number of cards. Search your library for up to that many basic land cards, reveal them, put them into your hand, then shuffle.
Legality
standardNOT LEGALpioneerNOT LEGALmodernNOT LEGALlegacyLEGALvintageLEGALcommanderLEGAL