Hypnos, God of Sleep

When Hypnos, God of Sleep enters the battlefield, tap up to X target creatures.
They don't untap during their controller's untap step for as long as you control
Hypnos, God of Sleep.
Hypnos lays on a soft couch in a musty cave in
the land of Cimmerians from which the river of forgetfulness and oblivion flow through.