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Fast mana plus White Plume is still good enough for Vintage, which should give you an idea of its power

At the end of the day, the downside to Flake Strike isnt much of a bother given how you can use one of Reshiram & Charizard GXs alternate attacks or just activate a switching card (Guzma, Switch, Escape Rope, etc.) to reset the effect and allow it to attack again

Location wise, there are two cards depicting Cornelia and you can also see the adventurer's airship in all its nostalgic glory

With these I was finally able to compete, and went from the absolute last ranking to better than #500 in the world (and counting) in less than a month

Not sure what could have happened to you

Good card recognition and game sense will allow you to understand an opponents deck type and possible win conditions so you can act accordingly