Not necessarily, as there are a few genuine monsters with 5000 ATK and DEF, namely Dragon Master Knight, Malefic Truth Dragon and Five-Headed Dragon.
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'Shield and Sword', a Normal Spell Card, can do that.
There is no such card of that name.
it means that they might have a special effect like the Calculator has a ? in its attack its effect being this card gains attack points equal to the tolal level of all monster on your side of the field x300
There is no legitimate card called Exodia the Dark Master. It is a well-known fake, and has 'Infinite' for attack, which is indication enough that the card is fake.
no but there is a Five Headed Dragon[Dragon/Fusion/Effect] ATK/5000 DEF/5000