Upon activation, it destroys all monsters your opponent controls
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You can, however, pay additional costs, such as kicker
Of course, as with all new Pokmon expansions, there will be some cards that become the meta of the meta
I also have the First three sets complete (basic, fossil, jungle), some extra collector sets (pikachu world collection, and a few neo sets), and all of the BK gold cards (unopened and in box)
While you might think its best to have 60 cards, filling a deck with high level monsters that could deal massive damage, this can lead to bricking