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The type is most common in Kamigawa sets, with appearances in other ones like Ravnica and Bloomburrow
You could replace them with much more useful cards, either for threat generation, comboing out, reanimation, or filtering through your deck
Heres the biggie: lands-matter decks
How we tested MTG Doctor Who Abigail spent weeks playing with the Doctor Who Magic: The Gathering set to get a good sense of how the decks work and interact with each other
Theres also a social benefit: The Ur-Dragon and Miirym have reputations as must-kill commanders because they run away with the game, a stigma which Ureni lacks
