Ethereal Grasp 
Instant
Tap target creature. That creature perpetually gains "This creature doesn't untap during your untap step" and "
: Untap this creature."
Legality
standardNOT LEGALpioneerNOT LEGALmodernNOT LEGALlegacyNOT LEGALvintageNOT LEGALcommanderNOT LEGAL