Card Game de Sekai ga Horobu Sekai ni Tensei Shite Card Shop o Kaiten Shitara, Shuui kara Zensaku Shujinkou da to Omowareteiru - Vol. 1 Ch. 3.1 - The…

[MangaDex]

 

[MangaRoxas]

A deck that revolves around beasts and rainbows? If only actual card games would have such creative concepts for their archetypes...

 

[GipoScribantino]

Strong deck but it smells like one that's easily countered, I have this hunch.

 

[Teslakana]

A deck that revolves around beasts and rainbows? If only actual card games would have such creative concepts for their archetypes...

Based on that, it seems to be somewhat heavily inspired by the Crystal Beast Deck from Yu-Gi-Oh, whose main boss Monster happens to be Rainbow Dragon and its two fusion variants.