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Sometimes you dont want to be in the best deck, you want to be in the deck that beats the best deck, if you think that everyone else knows what the best deck is

If the target creature is an illegal target by the time the spell tries to resolve (most likely because it has left the battlefield in response), it won't resolve and none of its effects will happen

Low Population Data Extremely low high-grade populations in the vintage market

Then, if you want to be extra spiteful, you would put in a Ravages of War as well, effectively having two copies of Armageddon in your deck and overriding the format's singleton rule