Anunnaki: Trade with Atlantis promo contains a set of 4 Commercial Pacts tiles with the Gaia icon.
You may fulfill a Commercial Pact with Atlantis if you control at least 1 Territory of it (the center of the Gaia board). This will give you the some rewards: to summon a Minor God, take an Artifact card, or even move your Action pawn to get an additional action.
