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While there are other ways to grant this ability to creatureslike with Curiosityhaving an effect that impacts your entire board is critical for tempo decks that rely on cheap and evasive creatures to deal even small amounts of damage

Savvy Hunter

This is our last week, by the by, so next week is Commander

Its also possible to use the Trafalgar Law card from the Blue Donquixote Doflamingo Starter Deck [ST-17] and Jozu from Two Legends [OP-08] to easily remove an opposing Character card from the field, thus weakening the opponents board presence

While it is possible to synergize with these effects, the value that The Darkness Crystal provides is more based on your opponents deck than your own