Ark Nova: Marine Worlds, an expansion for Ark Nova, introduces multiple new elements to the game, such as sea animals that each have to be played in new special enclosures that must be built adjacent to water.
Roughly half the sea animals are reef dwellers, and whenever you add a reef dweller to your zoo, you trigger the ability of all reef dwellers in your zoo. To deal with the dilution of the deck, naturally caused by adding more cards, all sea cards feature a wave icon, and whenever it is revealed in the display, you discard the first card in the row, then replenish.
You need a copy of the Ark Nova base game to play this expansion.