Checksum Dragon

Level 6 DARK/Dragon Effect Monster
400 ATK / 2400 DEF

When an opponent's monster declares an attack: You can Special Summon this card from your hand, then, gain LP equal to half this card's DEF. This Attack Position card cannot be destroyed by battle.

Rulings – Yugipedia

Printings:

Structure Deck: Rokket Revolt: SDRR-EN006 (Common) - 2019-08-15

Prices:

Cardmarket: 0.07 €
TCGplayer: $ 0.17