Originally, 'Atog' was just an anagram of 'goat', because goats are famous for being able to eat anything
Gravecrawler is the perfect example of a Zombie that never stays die, being able to return to the battlefield so long as you control a Zombie creature
Every Collector Booster will have one of these, and those will also have the Galaxy Foil versions as well (yes, there are six different versions across variant and foiling)
Charizard was the crown jewel of the original Base Set of the Pokemon Trading Card game, and this status has followed the mon even decades later
Example: A dedicated Empty the Warrens deck might want Sleight of Hand and Opt over Serum Visions to hit more mana that turn
Yiazmat is extremely difficult to defeat in-game, so since you went through all the perils of completing this sidequest, now your opponents have to go through the perils of battling this nearly indestructible ultimate boss