You may choose not to untap Phyrexian Gremlins during your untap step. {T}: Tap target artifact. It doesn't untap during its controller's untap step for as long as Phyrexian Gremlins remains tapped.
Near Mint - $1.300
Lightly Played - $1.000
Moderately Played - $900
Heavily Played - $800
Damaged - $700
Near Mint Spanish - $1.300
Lightly Played Spanish - $1.000
Moderately Played Spanish - $900
Heavily Played Spanish - $800
Damaged Spanish - $700