Library of Alexandria

Land   

: Add to your mana pool. : Draw a card. Activate this ability only if you have exactly seven cards in hand.

245 ME4 • ENMark Poole

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Oracle Text (click to copy):

10/4/2004
You may tap multiples of these in response to each other because the requirement for 7 cards is checked only at the time the ability is announced and not again when it resolves.