This creature gets +1/+0 for each color among Allies you control.
2
: Earthbend 5. (Target land you control becomes a 0/0 creature with haste that's still a land. Put five +1/+1 counters on it. When it dies or is exiled, return it to the battlefield tapped.)
Earthen Ally's first ability can give it at most +5/+0, that is, +1/+0 each for white, blue, black, red, and green. "Gold," "multicolor," and "colorless" aren't colors.