Witherbloom, the Balancer Affinity for creatures first showed up on a simple 4/4 with vigilance and that Argivian Phalanx costs two less mana than Witherbloom, the Balancer which is a stronger creature and grants a huge cost reduction and will straight up give you nearly free colorless instants and sorceries like Warping Wail or Skittering Invasion
Even cards like Solidarity turn into game ending plays, particularly when Rasaad can double its already absurd boost
Authority of the Consuls has certainly helped in recent months, but poor White control decks have, at least off-and-on, been knocked around silly by Urabrask's Forge and other pesky artifacts
The most valuable card (non-foil, non-alternate frame/art) thus far is Ugin's Labyrinth
namely that if a coin comes up heads 20 times in a row, then the next flip is more likely to be heads
Its for that second part, though, why many people will find room for Wondrous Crucible