A good chunk of these (if not all of them) are proxy cards. They're not real cards.

Dead giveaways are some slight differences in font, foil cards are not foil and you have English versions of cards that were only released in Japanese.
Some of the Commons may be real, it's hard to tell. Those cards are hardly worth anything though even if they are.

Typically it's easier to tell by weight of the cards as any proxy is manufactured much cheaper and is pressed having less layers of cardboard than an official card. They also lack a darker inside layer of cardboard hidden inside the card, which is method WoTC uses to mark their original products. A good test is to rip a worthless card and see if they contain the darker layer inside them. However I do not recommend that here since real and fake ones may be mixed.