It provides card selection, an evasive body, and cheap casting and crew costs all rolled into one
In the case of Magnezone, specifically, it is one of the best cards in Pokemon TCG Pocket because it not only has very high HP and an attack that can deal great damage, but also (and more importantly) because it has a great stage-1 card
20th anniversary pages are published and It's permanent edition book
Not only that, this card has a good amount of willpower and lore-generating capability too, since each quest gets you three lore, so it can tank some damage and still help you win the game.
Geralf plays into Thunder Junctions new Plot mechanic, timing your casts for a big burst that summons a horde of undead Token Creatures, ready to tear your opponents apart
Its an absurdly expensive Reserved List card, which is why you probably dont see it played often, though Commander players can get a taste of it from Eiganjo Dynastorian