Wikia

This card has the fourth (printed) mana cost on a in the OCG. However due to its ability of Soulshift, its mana cost is effectively only 8.
Ken Geki, Absolute Ruler ~Final Flare~ is one of few cards that can win the game via its effect. The others are:
Ken Geki, Absolute Ruler ~Final Flare~ is one of 4 creatures that have 23000 power. There is also 2 other psychic creatures (Final Storm Double Cross NEX, the Miracle Awakened and Devil Diabolos Zeta, Evil Awakened) as well as a regular creature, Terradragon Diruga Vejida. They are each tied for the fifth highest printed power on a creature, behind Storm Genji Double Cross, the Super Temporal in fourth, Gaial King Dragon, Raging Dragon Lord, Raging Dragon Lord and Romanoff Kaiser NEX, the Super Enlightened in third, Last Storm Double Cross, the Super Awakened in second, and Shachihoko GOLDEN Dragon and Heavy Death Metal, End of the Century in shared first.
Ken Geki, Absolute Ruler ~Final Flare~ has the most power on a creature with the Very Rare rarity.

Ken Geki, Absolute Ruler ~Final Flare~/Trivia