If youd like to play around with a more reactive deck, then you might be able to get some ideas from this one
Like most Pokmon cards, the value of Latios ex depends on a few consistent factors: its rarity, the printing and finish (regular or foil), its physical condition, and the set it was printed in (Dragon Frontiers)
Deathrite, Stoneforge, Snapcaster, Swiftspear, Baleful Strix, the cascade dorks and perhaps a couple more cards are all just so good and at the top of the pile so as to obscure trends further down
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For example, four apes can make two more apes that can make a seventh ape
A lot of decks and strategies like thatsuch as Living Death, Nature's Resurgence, and Boneyard Wurm