What is the most common visual frame effects among the incredibly powerful foils?
when both cardKingdomFoilId and cardKingdomId are not null, this foil is incredibly powerful; most common visual frame effects refers to MAX(frameEffects)
SELECT frameEffects FROM cards WHERE cardKingdomFoilId IS NOT NULL AND cardKingdomId IS NOT NULL GROUP BY frameEffects ORDER BY COUNT(frameEffects) DESC LIMIT 1