Green and red can do plenty with extra lands, and red has many tools to increase the damage dealt by ping effects
That said, MTG players were understandably concerned about the direction Magic is going
Shock lands Hurts so good Hallowed Fountain, Watery Grave, Blood Crypt, Stomping Ground, Temple Garden, Godless Shrine, Steam Vents, Overgrown Tomb, Sacred Foundry and Breeding Pool are all two-colour lands that come in tapped if you dont pay two life
All in one card, for just four mana, and Command Zone legal
Adding some changelings to a party deck will help you achieve a full party
Farseek, Nature's Lore, and Three Visits can fetch up non-basics and/or untapped lands, which are huge improvements over actual Rampant Growth