You may choose not to untap Amber Prison during your untap step. {4}, {T}: Tap target artifact, creature, or land. That permanent doesn't untap during its controller's untap step for as long as Amber Prison remains tapped.
Tempe Near Mint - $2.00
Queen Creek Near Mint - $2.00
Tempe Lightly Played - $1.90
Queen Creek Lightly Played - $1.90
Tempe Moderately Played - $1.70
Queen Creek Moderately Played - $1.70
Tempe Heavily Played - $1.50
Queen Creek Heavily Played - $1.50
Tempe Damaged - $1.40
Queen Creek Damaged - $1.40