Phyrexian Gremlins | Magic: The Gathering
Formats Phyrexian Gremlins is Legal in
Official Oracle Text for Phyrexian Gremlins
: Tap target artifact. It doesn't untap during its controller's untap step for as long as Phyrexian Gremlins remains tapped.
Official Rulings for Phyrexian Gremlins
10/4/2004 : Only prevents the artifact from untapping during untap step. Ones that untap during upkeep are not inhibited.
10/4/2004 : The target artifact can't untap if the Gremlins and the artifact are tapped during untap, even if it is your artifact, and you plan on untapping the Gremlins.
10/4/2004 : The effect does not end if the target stops being valid. For example, if it stops being an artifact.
10/4/2004 : Can target a tapped artifact.