However, there are other rewards to earn for each difficulty, so if those interest you, I'd still recommend at least beating those once
Flare of Duplication is neither of those, but the most common use case for this is to sacrifice your creature thats being targeted while creating a copy of the spell to aim at the original casters creature as a gotcha moment

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Part of that is due to Umbreon VMAX Alt Art's continued reign, but it's also due to it being a beautiful card in its own right