Mana Web

Artifact    (CMC:3)

Whenever any land target opponent controls is tapped for mana, tap all lands he or she controls that can produce any type of mana that land can produce.

WL • ENHannibal King

™ & © 1993—1997 Wizards of the Coast

Legal in: Mirage Block,Legacy,Vintage,Commander

Oracle Text (click to copy):

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

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View this MTG card on Gatherer

4/1/2008
When a land an opponent controls is tapped for mana, this card checks which types of mana (white, blue, black, red, green, or colorless) that land could produce using any of its mana abilities, not merely the one the player just used. Then it checks which lands that player controls have abilities that could produce any of those types of mana. Then it taps those lands.
4/1/2008
The lands that are tapped by Mana Web's ability don't produce mana as a result.
4/1/2008
The opponent can tap his or her lands for mana in response to Mana Web's ability triggering.

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Card Mana Web is not on TCGPlayer.