Glacial Fortress

Land   

Glacial Fortress enters the battlefield tapped unless you control a Plains or an Island. : Add or to your mana pool.

227 M12 • ENFranz Vohwinkel

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Legal in: Pioneer,Modern,Legacy,Vintage,Commander

Oracle Text (click to copy):

Glacial Fortress Land Glacial Fortress enters the battlefield tapped unless you control a Plains or an Island. {T}: Add {W} or {U} to your mana pool.

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10/1/2009
This checks for lands you control with the land type Plains or Island, not for lands named Plains or Island. The lands it checks for don't have to be basic lands. For example, if you control Watery Grave (a nonbasic land with the land types Island and Swamp), Glacial Fortress will enter the battlefield untapped.
10/1/2009
As this is entering the battlefield, it checks for lands that are already on the battlefield. It won't see lands that are entering the battlefield at the same time (due to Warp World, for example).

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