Showing the one card where the name is exactly “port town” and the set is “soi”

Port Town

Land

As this land enters, you may reveal a Plains or Island card from your hand. If you don’t, this land enters tapped.

{T}: Add {W} or {U}.

A haunted fog known as the Nebelgast shrouds the cities along Nephalia’s coast.

Illustrated by Noah Bradley

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Warhammer 40,000 Commander #289	$0.24	€0.27	0.04
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Magic Online Promos			0.20
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You may reveal any land card with either or both of the appropriate subtypes. It doesn't have to be a basic land. For example, you could reveal Canopy Vista from the Battle for Zendikar set to satisfy the ability of Port Town. (2016-04-08)
Lands don't have a subtype just because they can produce mana of the corresponding color. Port Town itself is neither a Plains nor an Island, even though it produces white and blue mana, so you can't reveal one to satisfy the ability of another. (2016-04-08)

If a Plains or Island is entering the battlefield from your hand at the same time as Port Town, you may reveal the other land to have Port Town enter untapped. (2016-04-08)
If an effect instructs you to put Port Town onto the battlefield tapped, it will still enter the battlefield tapped even if you reveal a land card from your hand. (2016-04-08)