Some are "dual lands" that tap for two colors or mana, such as Orzhov Guild Gate
In Norse mythology, Egon is probably closest to Hel, the goddess who rules over the underworld, a daughter of Loki
Or make Magneton weak to Fire due to its steel type that while it didn't exist at that time, can certainly be a nice nod to it
Obviously stealing planeswalkers can be very powerful, especially if you can ultimate them right away, but Callidus Assassins flash, as well as the fact that it destroys the creature rather than having your opponent get it back when it leaves the battlefield, are significant as well
And Magic , as it turns out, has a lot of math in it
4/3 Illustrated by Chris Rahn