Urza'sish lands

[GoblinGame]

This is a set of lands that I thought of the other day that is similair to the urza's lands in that if you get all 3 out there is a bonus for you. But instead of having them simply tap for more, I thought it would be cool if you could tap all 3 of them to get one of each color mana. Im not sure on the wording exactly but here is how they are now. Oh and im horrible at thinking of creative names so they will need better ones, please comment if you have any ideas.

Urza's Factory
Land
*tap*: Add 1 to your mana pool.
*tap*: If you control an Urza's Store, and an Urza's Skyscraper tap them both, and add WUBRG to your mana pool.

Urza's Store
Land
*tap*: Add 1 to your mana pool.
*tap*: If you control an Urza's Factory, and an Urza's Skyscraper tap them both, and add WUBRG to your mana pool.

Urza's Skyscraper
Land
*tap*: Add 1 to your mana pool.
*tap*: If you control an Urza's Store, and an Urza's Factory tap them both, and add WUBRG to your mana pool.

As I said im not sure on the wording, but I think this works. Any input would be appreciated.

Current Wording
Urza's Refinery
Land
: Add to your mana pool.

Urza's Factory
Land
: Add to your mana pool.

Urza's Storehouse
Land
: Add to your mana pool.
, Tap an untapped Urza's Refinery and an untapped Urza's Factory you control: Add {G} to your mana pool.

[Jacob Orlove]

You should give the tap ability to only one of the three lands. There's no need for them all to have it--plus, the current wording lets all three produce 15 mana.

Also, the names would have to change. But the idea seems fine.

[Ephraim]

I don't like calling them "Urza's" anything, since that's already been done before. It's an okay design name, though. I think we need to come up with something else later. "Factory" is a decent name; I think "Store" should be changed to "Storehouse" or "Warehouse" (preferably "Storehouse"); "Skyscraper" needs to be changed entirely. "Spire" would be appropriate. If you want all three to be somehow connected to production/manufacturing, "Refinery" may be more appropriate. Jacob is right that the ability to produce all five colours of mana ought to be associated with just one of the lands. I believe these should be templated as follows:

Urza's Refinery
Land
{T}: Add {1} to your mana pool.

Urza's Factory
Land
{T}: Add {1} to your mana pool.

Urza's Storehouse
Land
{T}: Add {1} to your mana pool.
{T}, Tap an untapped Urza's Refinery and an untapped Urza's Factory you control: Add {W}{U}{B}{R}{G} to your mana pool.

[GoblinGame]

Excellent Ephraim, that is how I was wanting to do it with all 3 tapping as part of the cost but I was unsure as how to do it and I could not think of any cards with similiar wordings that I could model off. I like the names as well.

[Ephraim]

Bump.

These are too cool to let them die. We need a new name for them though, since they can't be Urza's lands. Urza was better with colourless mana anyhow, so he isn't ideal from a flavour perspective. Maybe a progression of names suggestive of something renowned for the production of coloured mana, like:

Gem Refinery
Jewelry Factory
Mox Storehouse