While this card is face-up on the field, battle positions of all face-up Insect-Type monsters on your opponent's side of the field are changed into Attack Position. Each time this card destroys an Insect-Type monster as a result of battle, increase the ATK of this card by 500 points.
You don't really need Parasite Paracide to make the Insect Princess useful. You can also combine Worm Bait with Mystic Box or Shien's Spy to give your opponent a weak Insect type monster. With this combo you can deal pretty much damage and simultaneously increase the ATK of your Insect Princess.