Blue Mountain Butterspy

Level 4 DARK/Warrior Effect Monster
0 ATK / 1700 DEF

Cannot be Normal Summoned/Set. When you Normal Summon a Warrior monster: You can Special Summon this card from your hand. Cannot be used as Synchro Material.

Rulings – Yugipedia

Printings:

Number Hunters: NUMH-EN012 (Super Rare) - 2013-07-12
Legendary Hero Decks: LEHD-ENC07 (Common) - 2018-10-04

Prices:

Cardmarket: 0.20 €
TCGplayer: $ 0.21