Alien Overlord (CRMS-EN038) - Crimson Crisis Unlimited

You can Special Summon this card from your hand by removing 2 A-Counters from the field. Once per turn, you can place 1 A-Counter on each face-up monster your opponent controls. (If a monster with an A-Counter battles an Alien monster, it loses 300 ATK and DEF for each A-Counter during damage calculation only.) You can control only 1 face-up Alien Overlord.