Sea of Clouds

The dual lands that read your opponent count rather than your land drops invert the usual tapland tax. A standard enters-tapped dual makes you pay a tempo cost on the early turns it matters most; this one waives that cost entirely the moment a second opponent is at the table, which is to say in exactly the multiplayer environment it was built to live in. The result is a clean untapped Azorius source whenever you have company and a slow one when you do not, encoding "this is a card for the big table" directly into the land itself rather than relying on errata or restricted reprints. It is the structural opposite of color-pair fixing that punishes the long game: here the penalty exists in the smaller game and evaporates in the larger one. That makes it functionally a painless dual where it belongs and a deliberate liability where it does not, a piece of design that solves the tapland's worst trait by tying the tax to format rather than turn count.