Portal Games created an 2018 event kit with promo-cards for each faction of the base game. If you participate in the event, you can keep the 3 promo-cards of the faction you've played with at the event. For each faction you get 3 copies of the same card.
The Egyptians get a card called 'Pyramid' and has a production: 1 gold and 1 stone.
These cards are alternate artwork cards and replace the Pyramid cards found in Egyptian's deck in the base game