Between them lies a whole spectrum of Charizards, sealed boxes, and contest promos, each with its own story and price
4000 ATK out of nowhare won't really do much unless it has more going for it, and it can't use any of it's effects the turn you play it
A Killer Among Us Abundant Countryside Belonging Birthing Boughs Black Market Connections Crib Swap Formless Genesis Irregular Cohort Kindred Charge Littjara Maskwood Nexus Molten Echoes Mutable Explorer Personify Plane-Merge Elf (playtest) Reflections of Littjara Renewed Solidarity Riptide Replicator Rukarumel, Biologist Stalactite Dagger Volo, Guide to Monsters Volo, Itinerant Scholar Volrath's Laboratory Wolf-Skull Shaman
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However, this doesn't work for higher values of m because the number of basics in the starting hand is not constant and cannot be assumed to be any value like this without further calculations
Anything could be possible though