booster box op One Piece Card Game: Azure Sea's Seven Featuring the Manga Sabo as the grail card in this set Amazon.com: BANDAI NAMCO Entertainment One

Once they set their cards and attempt to end their turn, Mask Change Absolute Zero into Acid, wiping their entire back row and banishing it if you have Dark Law on the field

A blanket Monster negate in some cases can completely end a turn, which is what makes it such a good going second card

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North Wind Avatar North Wind Avatar sees some play in current Standard because its a large body that gets something out of your sideboard (in formats that allow you to have one)

You could also build a deck that uses great cards from your Urza, Prince of Kroog and Shorikai, Genesis Engine decks and adds some of the good green artifacts like Sarinth Steelseeker and a few powerful enablers like Kinnan, Bonder Prodigy

While prices will most definitely drop as the set is opened, as of right now, the average price of a mythic in Ultimate Masters is around $40 (at pre-reprint prices)