Green Blood Moon with a twist

[Guardian]

Card Name
1G
Enchantment
Whenever a non basic land comes into play, its controller chooses a basic land type. It becomes a basic land of the chosen type.

Since this is more flexible than Blood Moon, I believe it is safe to lower the cost by 1. I chose to make it green because green seems to me the color that like to change mana to whatever it wants. My inspirations for this card are Hall of Gemstones and Blood Moon, so I believe we have a nicew compromise between the two.

Current card:

Card name
1G
Enchantment
When Card name comes into play, choose a color. Non basic lands produce mana of the chosen color instead of their regular color.

Changes:
Me: Following Ephraim and Matt idea on memory issues.

[Ephraim]

Green tampers with mana, but blue tamper with land type. Furthermore, this card has a lot of memory issues associated with it, since each nonbasic land that comes into play after it hits the table may have a different basic land type. You might have each player choose a basic land type when this hits the table or during their upkeep and have each nonbasic land become that land type (the latter idea is very similar to [card]Hall of Gemstone[/card].) Also, while they're not identical, this seems rather similar to a card that was recently proposed (It has the correct wording for this kind of effect, by the way. I'm not sure if you can actually change the nonbasic supertype into the basic supertype, either. I mean, I suppose mechanically, you could, but that design never does so, despite having the opportunity.)

Lost Horizon

Enchant Land

Lost Horizon can enchant only a nonbasic land.
As Lost Horizon comes into play, choose a basic land type.
Enchanted land's type is the chosen type.
Sacrifice Lost Horizon: Each player may draw a card.

[Guardian]

If blue has fun with land types, it could become:

Card name
UG
Enchantment
When Card name comes into play, choose a basic land type. Whenever a non basic land comes into play, it becomes a basic land of the chosen type.

OR

Card name
1G
Enchantment
When Card name comes into play, choose a color. Non basic lands produce mana of the chosen color instead of their regular color.

I'd like to know your idea, because these are cheap hosers. The fact that they're green makes it more balanced I think, but they are very cheap.

[Matt]

Ouch, memory issues. Too hard to remember what lands are what.