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It does a bit too much for so little that banning it has to be done

Her ability is triggered by either ETB or attacking which can be very powerful when built around but awkwardly the precon doesn't do much to support this as there's no way to give Anikthea evasion (except her own subpar menace) or blink her

For players, it adds cards that can fit into commander or draft decks

Roiling Vortex is also interesting, dealing consistent damage, and you can deny their lifegain triggers

Regardless, the ability to put anything into play from your hand for free, provided you have more lands than its mana value, is a terrifying thing to play against