Speed Warrior is a Common Effect Monster card from Yu-Gi-Oh! (Synchron Extreme Structure Deck, SDSE). Current market price: $0.15.
Common
Synchron Extreme Structure Deck (SDSE)
Card Text
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.
