It is the third Core Booster of Series 8, following Abyss Rising and followed by Lord of the Tachyon Galaxy
The theme also comes with its own Ritual Spell, which lets you summon any Ritual Monster in the game as long as you use Imps as the tribute fodder, and the Ritual Spell can even recycle itself back to your hand while summoning a new Imp from the deck to then search a new Ritual spell or monster and yeah, you get the point
SE Secret Rare Odd-Eyes Phantasma Dragon X DARK Level 8 [ DragonPendulumEffect ] ATK 3000 DEF 2500 P Scale 0 You can discard 1 card
Leaving aside the fact Lance Parrish was included in this set, just feast your eyes on these things
But if you wade into these murky waters, use extreme caution
Except, it has Islandcycling, meaning that instead of putting it just outside the 99, I can just cut a land instead and keep it in