Thats 600 cards in total, which is larger than English booster boxes by quite a margin
The deck itself used tools like Artful Dodge, Distortion Strike, Shadow Rift, and Slip Through Space to ensure that their game ending blow would land without interference and in one attack
Galvantula ex 51/142 While an intriguging card, I doubt either Charged Web or Fulgurite are going to be strong enough to make Galvantula popular as an attacker on its own
Exalted Sunborn is also a card good at many stages of the game, and though not quite the powerhouse that Elspeth is, the warp ability allowing it to come down early to boost your velocity or come down for cheap later in a multi spell turn makes token doubling easier than ever
It also has square corners, so it seems to have been pulled from the production line after cutting and before corner rounding, the same time theyd pull filler cards