If I remember correctly, Pokemon is/was CMYK, with an extra Y spot color for the border, which is a different color of yellow than typically used for the Y printing plate
R Rare Dark Contract with Patent License X SPELL Field If your opponent Special Summons a monster(s) with the same card type (Fusion, Synchro, Xyz, or Link) as a "D/D/D" monster you control (except during the Damage Step): You can inflict 1000 damage to your opponent, also, while this card is on the field, your opponent cannot Special Summon monsters with the same card type as that Special Summoned monster for the rest of this turn
AA Authentic Altered This means that while PSA is certifying that the item is genuine, due to the existence of alterations, the item cannot receive a numerical grade
I also play very, very good cards, and I sometimes feel bad for playing them because I don't think it's that interesting to just grab the best new cardboard with the goal of maximizing my win percentage