Maglectric (💣) is the “new Emergency Shutdown”!

But:

• It's pre-installed (not “post-played”): so it won't tax your hand-size if you draw it a turn early (before there's something impactful enough to unrez, or before you have prepped for the successful-run, or when you have a click to spare, or so on). CF. Maxwell James.
• It's immediate: so you can derez an ice (on-success), then bounce that ice with Hermes (on-breach), if you steal an agenda from HQ.
• It can derez assets/upgrades too. (Though ice are still the most expensive card-type in rez-cost, as well as the most constrained in (re-)rez-timing. Besides badpubbing-assets or, esp., forfeiting-assets like Plutus.)
• It's unique: so you can't spam two after a single HQ-success, let alone double-derezzing during the same click. (But you can still install a second in between HQ-runs.)
• It's Hardware: for Az (creditlessly installed) and, esp., Baz (clicklessly installed). Baz can even derez the ice that “installed” Maglectric with Maglectric (afterwards).
• It's a Weapon: for Asmund Pudlat jank. (This is the most important difference.)