It's also looking for "forest cards" as opposed to basic forests when you search, so that will let you grab some shock lands if you prefer (though that's a hefty dose of life loss to absorb)
While other cards have similar effects in Magic, the Herald is the only one you can snap in at instant speed this way
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Given that it's not difficult to have more than two to three Swamps, especially when casting a five-mana creature, and that Urborg, Tomb of YawgmothUrborg, Tomb of Yawgmoth lets you do so while not having to actually stop yourself from playing utility lands, this has a rather rapid effect on the amount of mana available to you