Circle of Protection: White seems rather weak against a color designed to destroy enchantments, and many blue decks can take complete control of the game before leisurely bouncing a Circle of Protection: Blue (assuming they aren't just decking you to begin with)
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However, there have been times where this has been avoided, too, like Bloomburrow's Finneas, Ace Archer becoming Finneas der Meisterschtze, or Finneas the Master Archer
Since she brings the Grixis colors to the table as well as an instant/sorcery matters slate of themes, Kess is strong as she has access to the colors of removal, counters, burn, bounce, and card drawing
Pokmon tournaments such as Premier Challenges, Regional Championships and National Championships