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.)Godless Shrine gives white-black decks access to both colors from a searchable land. Its Plains and Swamp types work with several fetch lands, while its entry choice lets you pay two life for untapped mana or preserve life and accept a tapped land. That flexibility suits decks balancing early creatures, removal, and sacrifice engines.
Marsh Flats can find Shrine through either type. Flooded Strand can find it as a Plains, and Bloodstained Mire can find it as a Swamp. In an Esper or Abzan deck, this overlap makes it easier for different fetch lands to assemble the colors required by your hand rather than locking each fetch into one predictable target.
An aristocrats deck might use Shrine to cast a white token producer on one turn and a black payoff such as Blood Artist on another. Lifelink and recurring life gain can help offset occasional shock-land payments, but the land does not depend on those mechanics to function. Its main contribution is keeping both halves of the deck available as you sequence creatures and interaction.
You do not have to pay two life every time Shrine enters. If you are finished casting spells for the turn, entering tapped may cost nothing meaningful. A search that specifically instructs you to put the land onto the battlefield tapped still leaves it tapped even if you pay life. Keep the distinction between land types and basic status clear: Shrine is nonbasic, so Fabled Passage cannot find it despite the Plains and Swamp types.
