Beelzeus of the Diabolic Dragons

Level 10 DARK/Dragon Synchro Monster
4000 ATK / 4000 DEF

1 DARK Tuner + 2+ non-Tuner monsters
Cannot be destroyed by battle or card effects. Other monsters you control cannot attack. Once per turn: You can target 1 monster your opponent controls; any battle damage your opponent takes from attacks involving this card this turn is halved, also, change that monster's ATK to 0, and if you do, gain LP equal to its original ATK.

Rulings – Yugipedia

Printings:

Yu-Gi-Oh! 5D's volume 8 promotional card: YF08-EN001 (Ultra Rare) - 2015-10-06
Legendary Hero Decks: LEHD-ENB35 (Common) - 2018-10-04

Prices:

Cardmarket: 0.32 €
TCGplayer: $ 0.35