While 3000 ATK and an omni-negate are the standard for deck bosses, what makes Baronne de Fleur especially egregious is her completely generic summoning materials
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It sets up a Thoracle or Labman win and combos on its own with plenty of artifacts
If thats the case, consider slotting in something like Meowth which can draw extra cards, making it more likely youll find your Dragonite pieces quicker, or regular Articuno alongside Misty, which can also stall out the game
For example, if you chose "attack," casting a spell with "attacks," "attacking," or "attacked" in the rules text wouldn't cause the ability to trigger
Conservatively speaking, lets round down from 43.75% to 43% just to be safe