Obviously, being serialized means there is a finite fixed number of a given card, so it has a limited supply
That said, I would definitely include Goblin Guide and Eidolon of the Great Revel in the Mono-Red build, so if you have any copies stick them in the deck over the Elementals and/or Flames of the Bloodhand
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With their unique design, they make for a great addition to any collection
Or did it always have a key role to play one which twenty years of designers simply overlooked
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