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 - £0.80
Lightly Played - £0.70
Moderately Played - £0.60
Heavily Played - £0.40
Damaged - £0.30
Near Mint Non English - £0.80
Lightly Played Non English - £0.70
Moderately Played Non English - £0.60
Heavily Played Non English - £0.40
Damaged Non English - £0.30