There are at least a handful of cards that I think realistically have a shot at helping Humans keep up with the rest of the insanely new powerful cards that will likely reshape Modern as we know it
think loyal alignment in D&D, if you will
It is a little bit confusing, though
Each two-color pair in Magic: The Gathering FINAL FANTASY has a "draft archetype." This is a unifying theme across the cards in that color pair
The obvious cards for pairing with Sunken Citadel are Field of Ruin + Demolition Field or Nykthos, but there are almost certainly other possibilities out there
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