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While the Empty Jar player has nothing to discard/draw, the opponent will deck themselves out

This is a good effect, sure, but that's not where it real power comes from

A real cycle that was long incomplete but was eventually completed was the Mirrodin sword cycle: First we had Sword of Fire and Ice and Sword of Light and Shadow in Darksteel, and not until years later was the cycle completed in Mirrodin Besieged block, with Sword of War and Peace, Sword of Feast and Famine, and Sword of Body and Mind

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This could also result in a higher ping on your part, which will dramatically affect your gameplay