The artwork by Mitsuhiro Arita is the same illustration that appears on the Unlimited and Shadowless versions, but the 1st Edition stamp transforms it from a beautiful piece of card art into a piece of cultural history
Here are some key points to keep in mind: Limited Availability: These cards were released in limited quantities, making them rare and desirable

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Standard Brawl and Historic Brawl are both casual formats, so nothing is at stake
Grand Architects third ability is mostly just a way to tie the other two together letting your other artifact creatures (such as the above-mentioned Pili-Pala) join in on the mana production or adding bonuses to the artifact creatures you summon from the Grand Architects Crusade ability (such as pumping Molten-Tail Masticore or Wurmcoil Engine)
For MTG proxies, you want at least blue/black core board, around 300 gsm and 0.3 mm, plus decent printing and cutting, to get close to real MTG cards in sleeves