how to tell if yugioh cards are first edition Can someone tell me how do I know if the card is 1st edition..trying to identify these cards

Three cards are revealed in full and the identity of the cover card (but not its effects) are shown

Pendant: Length 31.41 mm/1.23 inches, Width 3.39 mm/0.13 inches, Height 42.03 mm/1.65 inches

When your opponent Normal or Special Summons exactly 1 monster (and no other monsters are Summoned) while this monster is on the field: You can make that monster lose ATK equal to its Level x 200 (until the end of this turn), and if you do, inflict damage to your opponent equal to the ATK lost by this effect.

Modern can feel intimidating, but Chas has a handy guide to help new players know which cards they shouldn't be without.