Aura Shards is already a marmite card, but putting it on a creature and offering other useful modes alongside it makes for a tempting inclusion for many decks
As a game goes on, you have access to more mana and want to cast multiple spells or creatures per turn, so the mana curve advises that you have more 2 and 3 mana cost cards than any other kind
Sure, Narcomoeba is a cute combination with it, but its a future-shifted card they found a neat environment to include in, nothing more
Although less rare than the manga-style variant, it is still highly collectible due to the characters popularity
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It can produce multiple mana of different colors in a single tap, and in multi-color decks it frequently produces three to five mana per activation