Force your opponent between giving up a prize and potentially losing an edge in the prize race or allowing you to draw four cards is quite the pickle
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Well all of that still exists in Pioneer AND can support the Heliod combo
You also want to attack with hasty creatures or beatdown cards like Vampire Interloper
The XX mana cost of Omarthis, Ghostfire Initiate doesnt work with the cascade focused Zhulodok, Void Gorger, and its inclusion brought in other X mana cards as well, creating anti-synergy confusion in the deck
If we discount the point total of Abzan Keywords or Sultai Mutate by 1/3 for an apples-to-apples comparison, they would have somewhere around 14 points, beating out Lord Windgrace by a full three points