Your search for "TGX300 EXVC-EN054" revealed the following:
TGX300 - EXVC-EN054 - Common - 1st Edition from Extreme Victory 1st Edition, available at 401 Games Canada. Rarity: Common Card Text:All face-up monsters you control gain 300 ATK for each face-up "T.G." monster you control.
TGX300 - EXVC-EN054 - Common - Unlimited from Extreme Victory Unlimited, available at 401 Games Canada. Rarity: Common Card Text:All face-up monsters you control gain 300 ATK for each face-up "T.G." monster you control.