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Card Details
Creatures don't untap during their controllers' untap steps.
At the beginning of each player's upkeep, that player may choose any number of tapped nongreen creatures they control and pay 
for each creature chosen this way. If the player does, untap those creatures.
Illustrated by Jerry Tiritilli
Rulings (1)
Feb 1, 2006
You can only untap nongreen creatures once, since this has a beginning of upkeep triggered ability.