Search your library for a Plains card, an Island card, a Swamp card, and a Mountain card. Reveal those cards and put them into your hand. Then shuffle your library.
2/1/2009 You don’t have to find all four cards.
2/1/2009 Shard Convergence checks for cards with the subtypes Plains, Island, Swamp, and Mountain, not for cards with those names. You may find nonbasic land cards this way, as long as they have appropriate subtypes.
2/1/2009 You may find “dual lands” with Shard Convergence. The Plains card you find, for example, can have a second subtype. What subtypes it has won’t impact what other cards you can find. For example, you may find a Hallowed Fountain (which has subtypes Plains and Island) as the Plains card, and another Hallowed Fountain as the Island card.