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then its a rule of the format that mess with that kind of cards :( ?

You are not. That ability is useless in the format. Other cards have the same "problem". Not all effects make sense in all formats.

then how i supose to use the second hability of "Karn the great creator" that says "−2: You may reveal an artifact card you own from outside the game or choose a face-up artifact card you own in exile. Put that card into your hand." if i dont have cards at my sidedeck?

Brawl does not allow sideboards. What you have in the deck is what you play.