Urborg, Tomb of Yawgmoth

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Rulings:

• 12/7/2018 Urborg, Tomb of Yawgmoth isn’t a Swamp while it’s not on the battlefield.
• 12/7/2018 Land cards not on the battlefield aren’t Swamps while Urborg is on the battlefield.
• 12/7/2018 Urborg’s ability causes each land on the battlefield to have the land type Swamp. Any land that’s a Swamp has the ability “<img src="/Handlers/Image.ashx?size=small&amp;name=tap&amp;type=symbol" alt="Tap" align="absbottom" />: Add <img src="/Handlers/Image.ashx?size=small&amp;name=B&amp;type=symbol" alt="Black" align="absbottom" />.” Nothing else changes about those lands, including their names, other subtypes, other abilities, and whether they’re legendary, basic, or snow.