Aerith does differ slightly in that she has a legendary subtheme, giving you a way to put those counters on all your other legendary creatures
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You may cast that spell without paying its mana cost, then put the other cards exiled on the bottom of your library
The play patterns are repetitive but fun, and the creature type has its lovers and haters
(In this way its more akin to a Magic Online league than a tabletop booster draft)
Most of the time he simply turns your spells into cantrips, but if the stars align he can actually double the spell in question, to potentially devastating effect