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Verdant Haven
Enchantment - Aura (Common)
Enchant land
When Verdant Haven enters the battlefield, you gain 2 life.
Whenever enchanted land is tapped for mana, its controller adds one mana of any color to his or her mana pool (in addition to the mana the land produces).

Nothing worth complaining nor celebrating imho.

It definitely feels like this could see some play in base green Limited decks.

seems like bad farseek at first, but if you have a way to untap a land anyway it starts being interesting.

Would prefer Fertile Ground . Might see some EDH play in decks that use Earthcraft , but not much.

Well, it's a card that works very well in limited with gate-elf (greenside watcher: 1G 2/1 that can tap to untap a gate). Play gate turn 1, gate-elf turn 2, this turn 3 and untap to play a 2-drop. On turn 4, play a land and cast almost any spell in GTC (you'll have 7 mana, 2 of which is any-colored). I draft often enough online that eventually I'll get the "nut" version of this deck with:

3+ copies each of Gate-Elf and Verdant Haven (very doable since they're both common and not high picks)
5+ gates
A primordial in every color (I see these going semi-late in 8-4's online, people don't rare draft and 7-drops are generally bad) 

... that consistently plops out a primordial on turn 4. I forsee this being the axebane guardian deck of triple GTC, undervalued and easily assembled at first, then turns into a fad where everyone is drafting 5c Verdant Haven.dek, then basically everyone abandons it once the format evolves and the 2-color decks get faster and more efficient, thus running over any attempts at 5-color durdles.