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 - $20.25
Near Mint Non-English - $20.25
Lightly Played - $19.25
Lightly Played Non-English - $19.25
Moderately Played - $16.25
Moderately Played Non-English - $16.25
Heavily Played - $12.25
Heavily Played Non-English - $12.25
Damaged - $10.25
Damaged Non-English - $10.25