I wouldnt call it a core mechanic, but its definitely a noteworthy set for those like myself who consider themselves Magic Foodies
The grading cost alone (typically $15-25) means you're getting the card and the grading for less than what it would cost to grade yourself
In terms of gameplay, Dragonite features the ever-popular (and powerful) Agility attack, which, upon winning a coin flip, gives the mon immunity from all damage and effects from an opposing mons attack next turn
4 Deep Clue Sea Get Investigating Deep Clue Sea, as the name might imply, is built around the investigate mechanic, creating Clue tokens while drawing extra cards
I also like the use of plot here, allowing you to set up either for the ideal turn to pump your team or for when your hand is empty and you really want to draw those four cards