Sephylon, the Ultimate Timelord

Level 10 LIGHT/Fairy Effect Monster
4000 ATK / 4000 DEF

Cannot be Normal Summoned/Set. Must be Special Summoned (from your hand) by having 10 or more monsters in your GY. Once per turn: You can Special Summon 1 Level 8 or higher Fairy monster from your hand or GY, but its effects are negated, also its ATK becomes 4000.

Rulings – Yugipedia

Printings:

Shonen Jump December 2011 subscription bonus: JUMP-EN054 (Ultra Rare) - 2011-12-01
Gold Series: Haunted Mine: GLD5-EN029 (Gold Rare) - 2012-06-07
Legendary Collection 5D's Mega Pack: LC5D-EN229 (Super Rare) - 2014-10-23
Premium Gold: Return of the Bling: PGL2-EN084 (Gold Rare) - 2015-03-19
Battles of Legend: Relentless Revenge: BLRR-EN056 (Ultra Rare) - 2018-06-28

Prices:

Cardmarket: 0.31 €
TCGplayer: $ 0.26