So how do you pick which ones to run
To determine the total cost of a spell, start with the mana cost or alternative cost (such as a flashback cost) you're paying, add any cost increases, then apply any cost reductions
Fetchlands like Misty Rainforest are great ways to reset the top of your library to get a fresh look with The Fourth Doctor, but Id also recommend trying out cards like Bant Panorama and Shire Terrace which enter the battlefield untapped and tap for colorless mana in the early-game, and then you can cash in for a basic land and shuffle your library later when you need it
Glorious Sunrise is an enchantment that gives green decks a ton of great options
Combine her with a Vorinclex Voice of Hunger and a Doubling Season, and you could be taking opponents of the game super-fast
Its crazy to think a colorless creature printed in Fifth Dawn would still be relevant in an eternal format 19 years later