Relic of Unrelenting Brachyura

{x}{u}{u}, {t}: Create X 0/3 blue Crab creature
tokens, then draw two cards.
You may cast Crab creature spells from your
graveyard by paying {u}{b} in addition to paying
its other costs.
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Unrelenting, unending, Thassa's crabs will rage
against all who threaten the seas.