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

WU dual that checks for basic land types, similar conditional untapped entry.

WU check land entering untapped based on controlled basics.

WU shock land for untapped dual fixing.

Original WU dual with Plains and Island types, always untapped.

WU filter land producing both colors.

WU dual entering untapped based on opponents' lands.

WU painland producing both colors untapped.

WU dual land with cycling and Plains/Island types.
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.
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.