Yes, these cards are generally legal in eternal formats like Vintage and Legacy, though they must be played in opaque sleeves to hide the distinctively rounded corners that would otherwise make them marked cards
A deck that draws well beats a pricier deck that draws poorly
The scanner detects whether a card is graded, identifies the grading company (PSA, Beckett BGS, CGC, ACE, TAG), and reads the certification number directly from the label using OCR
You can detect the errors by simply checking the lights and the beep sound from the smart jumper clamps
During your Standby Phase: You can draw cards equal to the number of different Monster Types in your GY, then place cards from your hand on the bottom of the Deck in any order, equal to the number of cards you drew