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Amonkhet can be a powerful set if you disregard the tribal synergies

While technically it is repeatable each turn, it'll be hard for an opponent to continually create 5 creatures or walkers each turn after red-eyes attacks particularly since they lost 2 cards in process to keep the engine running and it has no protection by itself so simple Murder will take care of it

Its probably not happening that much in Constructed MTG, but imagine this + Autarch Mammoth a 5/5 haste that produces two 3/3 elephants is approaching Titan/Overlord efficiency

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Was part of the intent with introducing subtypes right away to leave you more design space in the future