This monster is named after the Schwarzschild radius, the limit at which an object becomes a black hole. This is further referenced by "Ergosphere", which features this card in its artwork, directly supports it, and is named after the region in which objects begin to get sucked into a black hole.
This monster's body is twisted to resemble an infinity symbol.
It could also be interpreted as a sideways 8 to represent its Level.
By completing the loop with its tail near its mouth, it resembles an Ouroboros.
This monster appears in the artwork of "Ergosphere".