Blue 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 blue creatures they control and pay {4} for each creature chosen this way. If the player does, untap those creatures.
Near Mint - $1.00
Near Mint Non-English - $1.00
Lightly Played - $0.90
Lightly Played Non-English - $0.90
Played - $0.70
Played Non-English - $0.70
Heavily Played - $0.60
Heavily Played Non-English - $0.60
Damaged - $0.50
Damaged Non-English - $0.50