Magical King Moonstar

Level 3 DARK/Fiend Effect
900 ATK / 600 DEF

Cannot be used as a Synchro Material, except for the Synchro Summon of a DARK Synchro Monster. If you control a Tuner monster, you can Special Summon this card (from your hand). If this card is Normal or Special Summoned: You can target 1 other monster you control or in your Graveyard; until the end of this turn, this card's Level becomes the same as that monster's, also you cannot Special Summon, except by Synchro Summon.

Rulings – Yugipedia

Printings:

Premium Gold: Infinite Gold: PGL3-EN004 (Gold Secret Rare) - 2016-03-17
Structure Deck: The Crimson King: SDCK-EN015 (Common) - 2023-09-21

Prices:

Cardmarket: 0.12 €
TCGplayer: $ 0.11