I believe this may just come down to the fact that the Amber/Amethyst deck feels a bit more original and new than its counterpart, even though the Ruby/Steel deck was excellent
Like most Magic: The Gathering cards, the value of Feed the Machine depends on a few consistent factors: its rarity, the printing and finish (regular or foil), its physical condition, and the set it was printed in (Archenemy Schemes)
Even pulling them from packs in gem mint condition can prove very difficult
More than once during the first wave, I got under an hour only to be kicked back to a three-hour wait
The magical Christmas-land scenario where you get a turn 3 win(ota) looks like this: Turn 1: Play a land, cast Sol Ring, drop two cheap creatures like Rograkh, Son of Rohgahh, Ornithopter, or Ornithopter of Paradise
The Prismatic Bridge has you reveal cards from the top of your deck until you find a creature or planeswalker, putting that card onto the battlefield under your control