In other words, a copy of a card that wasnt made by Wizards of the Coast, or a genuine card that is altered to appear like a different card, usually an older and higher value variant
If your deck is consistently trying to close the game out before the lategame (turns 7-9) and includes multiple tutors, game-changers, extra turn effects, or land restriction effects in it, theres a good chance your deck is an Optimized one
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This is caused by the fact that the sheets on which the cards are printed have more selvage on one side than the other, and are therefore not perfectly centered
Switch the ATK and DEF of 1 Warrior-Type or Machine-Type monster on your side of the field until the end of your opponent's next End Phase