WotC is changing the rules slightly
Sure, they are all in one convenient bundle of flexibility but the options you lose by it not being at one mana is comparable to the options you gain by having them all from one card
With its second ability, you can burn through land pockets or even the lands you exile with the Sword by playing extra lands if you can deal combat damage to an opponent
Ramunap Excavator takes a slightly different path and straight up plays your lands from the graveyard to turn your creature lands into Gravecrawlers
Well, thats a shame, but you can check out our rankings in the other color trios here: Abzan cards, Esper cards, Grixis cards, Jeskai cards, Jund cards, Mardu cards, Naya cards, Sultai cards, and Temur cards