The genre of "One Piece TCG: Awakening of the New Era Booster Pack [OP-05]" is Gaming
Containment Priest completely shuts down Dredge, Oops and Reanimator strategies (when you come across them) and, frankly, has caused more immediate concessions than almost any other sideboard card
Late game she adds a whole new dimension by potentially coming out with six or more loyalty

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Fleet Swallower + Terisian Mindbreaker Most of the cards that mill half of an opponents library are primarily useful alongside Bruvac the Grandiloquent who turns these triggered abilities into whats effectively destroy target player
I thought Kindled Fury was about as much power as Wizards would pack into a R combat trick, but I was wrong