Five damage is enough to kill almost anything, instant speed is important, and delve isnt hard to enable (especially when youve got cards like Winding Way)
[41] The following cards feature the SCH set code, but also the FF game identifier: Store Championship: Prophetic Beginning (reskinned Preordain for participation), Diabolos, Guardian Force (reskinned Death's Shadow for Top 8), and Bhujerba, Floating City (reskinned City of Brass for the winner)
It works best paired with cards that generate evasive creatures like Bitterblossom or Alela, Artful Provocateur to enable raid as consistently as possible
Again, this doesn't matter so much over the long term because the supply of these decks will be massive, so things will even out, but for the short term, having $30 more in value is a reason to take Stalwart Unity, Breeding Lethality, or Invent Superiority over the other two decks
Fast forward to today, and games are decided more often on the single-target removal played, and timely use of cards like Heroic Intervention