Speed Warrior

Level 2 WIND/Warrior Effect
900 ATK / 400 DEF

Once per Battle Phase, if this card was Normal Summoned this turn (except during the Damage Step): You can make its ATK become double its original ATK, until the end of the Battle Phase.

Rulings – Yugipedia

Printings:

Starter Deck: Yu-Gi-Oh! 5D's: 5DS1-EN012 (Common) - 2008-08-05
Duelist Pack: Yusei: DP08-EN002 (Common) - 2009-02-24
Starter Deck: Yu-Gi-Oh! 5D's 2009: 5DS2-EN015 (Common) - 2009-06-09
Duelist Pack Collection Tin 2010: DPCT-ENY05 (Super Rare) - 2010-03-05
Starter Deck: Duelist Toolbox: 5DS3-EN011 (Common) - 2010-05-28
Legendary Collection 5D's Mega Pack: LC5D-EN003 (Common) - 2014-10-23
Synchron Extreme Structure Deck: SDSE-EN011 (Common) - 2015-08-27

Prices:

Cardmarket: 0.07 €
TCGplayer: $ 0.14