Polaris, Druid of Nature

For each basic land used to cast Polaris, Druid of Nature, search your library for another basic land that shares a name with that land, reveal it and place it into your hand. Shuffle your library.
{w}{u}{b}{r}{g}{t}: Return Polaris, Druid of Nature to your hand, until end of the turn you may place all lands from your hand onto the battlefield.