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While you might not come across every top-level deck at your local card store, its good to have an idea of whats currently in vogue so you can plan for it and try to add some counters to your deck

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Forest Seal Stone takes this deck to new heights by being able to be used under Path to the Peak [Chilling Reign] (it is currently bugged on PTCGO, but has been ruled that you can use the Ability because it is printed on a Trainer card), you have options to attack with Meloetta [Fusion Strike] aggressively, and you have a strong matchup spread

At the end of the Damage Step, if this card battled an opponent's monster: You can activate 1 of these effects