Even if you aren't comboing with it, he just provides so many cool things you can do in general that there's a reason he's as heavily used in Commander as he is, dead or otherwise
Steal all of the creatures for the turn, give them haste, untap them, and swing and kill players that are already wounded with damage to them
Just count it as a special bonus that Staff of the Ages stops all landwalk abilities, which also include cards like Livonya Silone and Ayumi, the Last Visitor
This makes it a perfect inclusion in decks like Chulane, Teller of Tales, Karador, Ghost Chieftain, and it works exceptionally well in Yarok, the Desecrated
Radstorm may take a little setting up to achieve its full potential, but with the right combo, it can wipe out an entire table, leaving you the sole victor standing in the irradiated rubble
Pretty good, really, because it's 1 mana to stop something huge and impactful