Flitch's Core

{b}, Sacrifice a land: Each creature you control gets +1/+1 until the end of turn.
{g/w}{g/w}: Return a land from your graveyard to your hand. You may play an additional land this turn.
{w}{w}{b}{b}{g}{g}: Search your opponent's library, graveyard, and hand for up to 3 basic land cards and reveal them. Put them into your hand, and shuffle their library