Mercadian Masques rare. This was inspired by the Legends classic Land Equilibrium. Though popular, the problem with Land Equilibrium was that it had no safety valve for when opponents can just lock that resource up (such as Armageddon). In modern design, cancelling a basic resource in the game often means you have to use that resource to keep the cancellation going, which automatically provides a safety valve. This practice actually hails back to Stasis, which stops players from untapping, but requires tapping a card each turn to keep it around.
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