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 - $0.70
Near Mint Non-English - $0.70
Lightly Played - $0.60
Lightly Played Non-English - $0.60
Played - $0.50
Played Non-English - $0.50
Heavily Played - $0.40
Heavily Played Non-English - $0.40
Damaged - $0.30
Damaged Non-English - $0.30