The light will either be completely blocked (card is too thick/dark) or it will glow a bright, fiery orange/yellow because the paper density is completely wrong
They also have several common subtypes, from equipment to vehicles, and its often used as the card type for tchotchke tokens like Treasure, Food, and Blood
7 Blue-Eyes White Dragon - Yu Gi Oh
The most expensive SIRs feature mainline characters: Charizard, Pikachu, Eeveelutions, Mewtwo, Mew
6 Parting Gust Uncommon - $0.62 A surprisingly powerful uncommon, Parting Gust is a two-mana instant that lets you exile a nontoken creature, with a bit of a stipulation tied to it
Nonetheless, The Dark has some pretty cool sleeper hits and staples to look out for