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If you start with a Background in your command zone, its much more likely youll get to take full advantage of these cards

Territorial Kavu Territorial Kavu is secretly a 5-color card (though it works with four colors) and its a highly efficient one

It's called Hidden Potential Tin

buildingadeck says

This ability not only influences battles by boosting Fire-type moves and weakening Water-type attacks but also narratively ties into its ancient feud with Kyogre, the ocean-controlling counterpart

Weathered Wayfarer : Allows you to search for any land from your deck, providing card advantage and ensuring you make your land drops