Mana Web affect lands that generate colorless mana?

[Dave]

Hi all,

Does Mana Web's ability work on lands that only produce colorless
mana (e.g. the Urza's lands)?

Mana Web
{3}
Artifact
Whenever a land an opponent controls is tapped for mana, tap all
lands that player controls that can produce any type of mana that
land could produce.

- Dave

[Daniel W. Johnson]

Post by Dave
Does Mana Web's ability work on lands that only produce colorless
mana (e.g. the Urza's lands)?

Sure, why not?

Mana
Mana is the energy used to play spells and is usually produced by lands.
Mana is created by mana abilities (and sometimes by spells), and it can
be used to pay costs immediately or can stay in the player's mana pool.
See rule 406, "Mana Abilities."
Colored mana costs, represented by colored mana symbols, can be
paid only with the appropriate color of mana. Generic mana costs can be
paid with any color of, or with colorless, mana. See rule 104.3.
The spell or ability that adds mana to a mana pool may restrict how
it can be used. An ability might produce mana that can be used only to
play creature spells or only to pay activation costs.
The type of mana a permanent "could produce" is the type of mana
that any ability of that permanent can generate, taking into account any
applicable replacement effects. If the type of mana can't be defined,
there's no type of mana that that permanent could produce. The "type" of
mana includes both its color (if any) and any restrictions placed upon
it.

[Lee Sharpe]

Post by Dave
Hi all,
Does Mana Web's ability work on lands that only produce colorless
mana (e.g. the Urza's lands)?

Sure thing. It's a type of mana, and there's no mention of "color".

[David DeLaney]

Post by Dave
Does Mana Web's ability work on lands that only produce colorless
mana (e.g. the Urza's lands)?

Yes. "Colorless" is a perfectly good _type_ of mana, though it is of course
not a _color_ of mana.

Post by Dave
Mana Web >{3} >Artifact
Whenever a land an opponent controls is tapped for mana, tap all
lands that player controls that can produce any type of mana that
land could produce.

ObWeirdExample: Mishra's Workshops will only cause each other to tap from
Mana Web, as they are the only things in the game with the type of mana
"Colorless; spend this mana only to play artifact spells".

Dave