Imagine all the games where you land-ramp out of control, then picture that in a counter-based deck where you get to proliferate on every landfall trigger
While you lose Fierce Guardianship, you gain Teferis Protection, Galadriels Dismissal, et al
They track the most popular and competitive decks in every format, and you can just buy a deck entirely through their site
Example Decklist: Selesnya Ouroboroid in Standard Ouroboroid | Illustration by Samuel Perin Planeswalker (1) Creatures (28) Agent Bishop, Man in Black x2 Ambitious Augmenter x2 Badgermole Cub x4 Dyadrine, Synthesis Amalgam x2 Leatherhead, Swamp Stalker x2 Llanowar Elves x4 Michelangelo, Weirdness to 11 x3 Ouroboroid x3 Pawpatch Recruit x4 Surrak, Elusive Hunter x2 Instants (2) Erode x2 Sorceries (4) Enchantments (2) Seam Rip x2 Lands (23) Abandoned Air Temple x3 Forest x7 Hushwood Verge x4 Multiversal Passage x2 Plains x2 Starting Town Temple Garden x4 Sideboard (15) Ba Sing Se Defend the Rider x2 Elspeth, Storm Slayer Erode Keen-Eyed Curator x2 Rest in Peace x2 Scrapshooter x2 Sheltered by Ghosts x3 Surrak, Elusive Hunter Green monsters are no stranger to Magic, and I bet that 10 years from now, a heavy green deck can rock a low curve and competitive

It takes you through everything from how to do readings for others or yourself to which layouts to choose to how to understand the meaning behind the cards that you draw