This Legendary Land can be tapped as a source for one colorless mana, or if the controller pays two generic mana and taps Geier Reach Sanitarium, allows each player to draw a card, and then discard a card
If all this card did was just read: "Lands you control have 'Tap: make a mana of any color," it would hit a few slots back on the next list, but it breaks defensively minded brews since they aren't punished for not using their mana each turn since they can just tap it for Treasures
We rather like the idea of this strategy Drop a bunch of tokens with Raise the Alarm, Hordeling Outburst, Brimaz, Goblin Rabblemaster (and Mardu Charm which can also serve you well against Courser of Khrupix)
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Prismari (blue-red) emphasizes magical art through the use of elements Quandrix (green-blue) students wield mathematical magic Silverquill (white-black) specializes in verbal magic Witherbloom (black-green) is full of nature mages