CardName: Mirrodin
Cost:
Type: Legendary Land
Pow/Tgh: /
Rules Text: Lands you control have "{T}: Add {1} to your mana pool."
Flavour Text:
Set/Rarity: Multiverse Design Challenge None
A Mirrodin version of Urborg, Tomb of Yawgmoth, which gives lands the "Cave" ability... This seems inevitable for Mirrodin. It's obviously usually not very useful! But hopefully has a niche with lands that DON'T have this ability built in, or with anything that cares about colourless mana.
I wanted to add something about artifacts, but hopefully colourless makes the point well enough and everyone is avoiding more artifact lands.
Hmmm. Intriguing ability, certainly. There are some lands that would benefit from this ability - Horizon Canopy, Barbarian Ring and its cycle, a few others - but not very many. (Sadly it doesn't actually help City of Brass). And this doesn't really scream Mirrodin to me... Mirrodin didn't especially have a "colourless" theme. I feel that a card for Mirrodin should explicitly say "artifact" on it somewhere.
: Add 
to your mana pool."
See Challenge # 120.
A Mirrodin version of Urborg, Tomb of Yawgmoth, which gives lands the "Cave" ability... This seems inevitable for Mirrodin. It's obviously usually not very useful! But hopefully has a niche with lands that DON'T have this ability built in, or with anything that cares about colourless mana.
I wanted to add something about artifacts, but hopefully colourless makes the point well enough and everyone is avoiding more artifact lands.
Hmmm. Intriguing ability, certainly. There are some lands that would benefit from this ability - Horizon Canopy, Barbarian Ring and its cycle, a few others - but not very many. (Sadly it doesn't actually help City of Brass). And this doesn't really scream Mirrodin to me... Mirrodin didn't especially have a "colourless" theme. I feel that a card for Mirrodin should explicitly say "artifact" on it somewhere.