Rocxidi
The Jim Reaper
Magnezone traps: Skarmory, Scizor, Ferrothorn, and Klefki regularly and traps Excadrill, Heatran and Magnezone locked into not effective moves and can be used to to pick off weakened Heatrans and Metagrosses.
But yeah not as good as Shadow Tag
Magnezone only traps Skarmory and Ferrothorn. You need Scarf to outspeed Scizor. Everything else is to fast or bulky.