Brron (GX) Signature Cards Idea:

• 20 cards first released after Tengu's card pool closed (2011-09-17): Ceruli, Guru of Dark World, Charge Into a Dark World, Clorless, Chaos King of Dark World, Dark Corridor, Dark Scheme, Dark Smog, Dark World Accession, Dark World Archives, Dark World Brainwashing, Dark World Punishment, Dark World Puppetry, Genta, Gateman of Dark World, Grapha, Dragon Lord of Dark World, Grapha, Dragon Overlord of Dark World, Latinum, Exarch of Dark World, Lucent, Netherlord of Dark World, Parl, Hermit of Dark World, Reign-Beaux, Overking of Dark World, Snoww, Unlight of Dark World, The Gates of Dark World

Checked against the Tengu format Forbidden & Limited list (September 2011) as of 1 September 2011 and its card pool (no card first released after 17 September 2011), with the sizes and copy limits of a Anime deck.