It only adds colourless mana to your mana pool as standard, but youre rarely going to be playing it as Echoing Deeps
For decks with three or more colors, where you might only be able to afford a small number of MDFCs since you'll need most of your lands to either be basics (for ramping / tutoring purposes) or tap for multiple colors of mana, the best MDFCs are Bala Ged Recovery (seriously, if you have green mana in your deck, play this card), Valakut Awakening, Hagra Mauling, and Ondu Inversion, along with the mythic cycle, which is almost always good if you can afford another land that only taps for a single color of mana
This was a reason to splash green into your control deck, or splash white if you were pulling a Mike Pistulnik
I'd expect poison counters to feature somewhere (perhaps Skrelv's Hive), oh and Felidar Sovereign, probably the easiest alt wincon in the Commander format