Ishizu Ihstar (DSOD) Signature Cards Idea:

• Exchange of the Spirit is Forbidden
• at least 26 cards first released after Tengu's card pool closed (2011-09-17): Agido the Ancient Sentinel, Blast Held by Destiny, Called by the Grave, Exchange of Despair and Hope, Gravekeeper's Ambusher, Gravekeeper's Headman, Gravekeeper's Heretic, Gravekeeper's Inscription, Gravekeeper's Nobleman, Gravekeeper's Oracle, Gravekeeper's Shaman, Gravekeeper's Spiritualist, Gravekeeper's Supernaturalist, Gravekeeper's Trap, Hidden Temples of Necrovalley, Imperial Tombs of Necrovalley, Kelbek the Ancient Vanguard, Keldo the Sacred Protector, Mudora the Sword Oracle, Necrovalley Temple, Necrovalley Throne, Qardan the Clear-Sighted, Soul Crossing, Tarai, Temple of the Mind's Eye, Zolga the Prophet

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.