Number 39: Utopia Roots

Level 1 LIGHT/Warrior Xyz Effect
500 ATK / 100 DEF

2 Level 1 monsters
When any player's monster declares an attack: You can detach 1 Xyz Material from this card; negate the attack, and if you negated an Xyz Monster's attack, this card gains ATK equal to that monster's Rank x 500.

Rulings – Yugipedia

Printings:

Legacy of the Valiant: LVAL-EN048 (Rare) - 2014-01-24
Legacy of the Valiant: LVAL-EN048 (Ultimate Rare) - 2014-01-24

Prices:

Cardmarket: 0.43 €
TCGplayer: $ 0.71