Boot Sector Launch (EXFO-EN053) - Extreme Force Unlimited

All "Rokket" monsters on the field gain 300 ATK/DEF.
You can activate 1 of these effects;
• Special Summon up to 2 "Rokket" monsters with different names from your hand in Defense Position.
• If your opponent controls more monsters than you do: Special Summon "Rokket" monsters with different names from your GY in Defense Position, up to the difference.
You can only use this effect of "Boot Sector Launch" once per turn.