It gets you back an instant or sorcery for three mana, which is pretty standard, but it offers more
[31] Red is a silent character, and doesn't have a distinct storyline or role within the wider series narrative following his first appearance
Basic lands come in six types, with each of the six producing a different type of mana when tapped: Plains produce white mana, Islands produce blue, Swamps produce black, Mountains produce red, Forests produce green, and Wastes produce colourless (and are much, much less common than the other five, having only appeared in one set)
You hopefully already have your color, making Sol Ring far better
Here is what that would look like: You Declare Najeela as an attacker and attack an opponent unable to block or kill her