Your search for "Swiftstrike Armor GLAS-EN073" revealed the following:
Swiftstrike Armor - GLAS-EN073 - Common - 1st Edition from Gladiator's Assault 1st Edition, available at 401 Games Canada. Rarity: Common Card Text:During your Draw Phase, if you draw a "Six Samurai" Monster Card, you can Special Summon it.
Swiftstrike Armor - GLAS-EN073 - Common - Unlimited from Gladiator's Assault Unlimited, available at 401 Games Canada. Rarity: Common Card Text:During your Draw Phase, if you draw a "Six Samurai" Monster Card, you can Special Summon it.