"Lightray" is a series of LIGHT monsters that debuted in Galactic Overlord. In contrast to Dark counterparts, they are LIGHT versions of existing monsters.
All "Lightray" seem to have the same blue-and-white color scheme. They're mostly Special Summoned by having a certain number of cards banished or in the Graveyard, and focus on banishing LIGHT monsters and supporting LIGHT Attribute monsters.
Monster Cards
Effect Monsters
Spell Cards
Trap Cards
Xyz Monsters
Link Monsters