Rock Lock

When Rock Lock enters the battlefield, tap target artifact, tapped artifact doesn't untap in
opponents next turn.
———{line}{line}{line}{line}{line}{line}{line}{line}{line}{line}{line}{line}{line}{line}
"U.A. students or not, kids are kids. Of course I was worried about 'em. But give them room to shine and...
every one of them... is even more of a hero than us
adults!"