You risk your mind by traveling into the 
Valley of the Lethe where only its lord, 
Toecap, is master of his own memory. Before 
entering, you ponder the ancient riddle of 
the Lethe, "The only way to remember is to forget."
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Each time you use a card of a particular 
power, you may not reuse that card
until all cards of that power type have been used.