In the manga, their effects activate when both duelists have one part of the pair in their Extra Decks, while in the TCG, they instead activate if one duelist has both on the same side of the field
A single crease or scratch can drastically lower both their aesthetic appeal and resale value
Unfortunately for cards like Aegis Turtle and Serra Angel, they're from an era long ago, so we can say goodbye
Drill Peck, Blissey at a little above 50%, Softboiled brings it to full HP again
There is no canon reason why it would be this close to someone, but one can imagine they would be in incredible pain considering it is literally molten rock
Mirran Crusader You probably never want to run this guy mainboard, but out of the sideboard he's an extremely potent threat against Abzan, both on offense and defense