A prime example of this surge is the Sun & Moon Ultra Prism Secret Rare Lillie Full Art card
Sine Mono-Green decks generally are creature and combat-focused, this makes Craterhoof Behemoth especially terrifying, as the X values will likely be very high, allowing you to swing out with giant creatures, all that gain trample to likely take anyone, if not the entire group of players out in one combat phase
a three-cost do-nothing turn can be bad for tempo decks, and the lack of haste means the enemy will have time to respond
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So a deck full of deathtouch creatures is going to be something that most players will be hesitant to attack
A grading company will look at your cards under a microscope, looking at all the tiny details of the card to make sure they're perfect