Yo! This is ShinyMan. Thanks for commenting on my blog. In response to your courtesy, I'm here to see your blog.
Looking from the openess of T2 right now there could be hundred of deck archetypes between tier 2 to tier 1. Dovescape has always been a tier 1.5 at best. (Win sometimes but doesn't get played and win consistently.) It might take endless effort to push it up to tier 1. But I sure would like to pad your shoulder and say 'Go for it, man!'
And that hypothetical card would still qualify as an uncommon. Check it out yourself: the biggest demarcating line between rare and non-rare color-fixing lands is that the rare ones are capable of color fixing the first turn they come down without additional help. Very rarely, some of the uncommon ones can color-fix the first turn they come down, but only with additional payments or with conditions on how the mana can be spent.
Cards which move up and down in value like this are great for the depth and replayability of a limited format.