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I cant possibly list here all the strategies because I am pretty sure there are 50+ viable decks that you can pilot to a tournament win, so I am including here the ones you are most likely to fight against, either because they are very strong or popular among new players

Decidueye ex is classified as a 2-Stars card in the Celestial Guardians set

5 Wurmcoil Engine Wurmcoil Engine is an essential card in a lot of decks

Cards like Syr Konrad, the Grim and Sefris of the Hidden Ways are also solid inclusions

Uncommon: x 30

If you go with the more item-heavy route, pick restoratives so your Manaphy wont get knocked out early