A battlebox using only blue and red cards from the Glory to the Firemind cube: https://cubecobra.com/cube/list/firemind

Each players starts with the following cards in exile:
Island, Mountain, Steam Vents, Shivan Reef, Desolate Lighthouse, Temple of Epiphany, Lutri, the Spellchaser

Players start with 4 cards in hand, and can play 1 land per turn from exile.