Boost Warrior

Level 1 FIRE/Warrior Effect Monster
300 ATK / 200 DEF

If you control a face-up Tuner monster, you can Special Summon this card from your hand in face-up Defense Position. All Warrior-Type monsters you control gain 300 ATK.

Rulings – Yugipedia

Printings:

Duelist Pack: Yusei 3: DP10-EN012 (Super Rare) - 2011-01-21
Battles of Legend: Armageddon: BLAR-EN063 (Ultra Rare) - 2020-07-23

Prices:

Cardmarket: 0.10 €
TCGplayer: $ 0.26