Oliver only had a single Teferi in the sideboard, so he could have played four instead of adding a color if he just wanted three-mana planeswalkers, but Oko is enough better to justify adding another color and playing a maindeck Breeding Pool in his Jeskai deck
Eldritch Evolution 1GG Sorcery As an additional cost to cast Eldritch Evolution, sacrifice a creature
Upon its reveal, competitive players immediately started looking for great Lugia VSTAR targets, which we now commonly know is Archeops, also from the Silver Tempest set
Arcades, the Strategist Arcades is one of the OG Elder Dragons, so it makes sense hed find his way onto one of these lists
White has long been known as the worst MTG color for drawing cards, and for years its poor performance in EDH was lamented by all