Consider this: in most casual builds, Centaur Healer is probably the worst creature above, right
When you dont need the mana anymore or perhaps draw the Loamspeaker later in the game, you can start animating your lands and swing in for an extra three damage with the Loamspeakers second ability
Also, nobody is every doing anything close to fair with this card, so its even better thank it seems
That said, R&D didnt muck around with this one
[10] Players spending hundreds of dollars to acquire multiple copies of each of the powerful rares was not anticipated at the time, as the developers assumed players would stop at around 30-50 dollars
Including some of the top colorless cards MTG players utilize for utility can also help smooth out your mana production or provide generic answers that your specific colors might lack