They reset creatures with undying, kill small creatures for death triggers, and provide consistent triggers for cards like Hapatra, Vizier of Poisons and Auntie Ool, Cursewretch
It's the same effect as Electromancer, but for everything
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Ultimately, this artwork made by Akira Egawa makes Alakazam's alternate card a clear standout in the Genetic Apex set
Crystals are more likely to see play in 2+ color decks than the Medallions
Control Magic is a powerful card in Commander already, and New Blood is a strict upgrade (since it's not an enchantment sitting on the battlefield to be killed or waiting for the creature to be blinked) if you're playing a Vampire deck