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
Spells you cast cost 1 less for each card your opponents have drawn this turn
Perhaps it's a way to represent levelled-up magic, like the Thunder-Thundara-Thundaga progression that black mages use
They may be completely right, or only partly right, but I still feel like the ball was dropped
They are evensomehowStandard legal, so anyone playing that format on Arena is going to run into these options
Some immediate creatures you could bring back include Kroxa, Titan of Death's Hunger, and Blood Artists for maximum value