This card's Japanese name, "Stargate" and its artwork is a reference to the scene from 2001: a Space Oddysey in which Dave Bowman approaches the monolith on Jupiter and suddenly finds himself travelling through a tunnel of light.
This card's Japanese name also references the Television series Stargate.
Finally, the name "Stargate" references the Level Stars used for monsters.
For each counter on "Spacegate", a star circles the player. This is similar to the way Xyz Material Monsters are depicted.