|Effect||At the end of the Damage Step, if this card attacked or was attacked: Your opponent draws 1 card.|
Chainsaw Insect has to be one of the greatest level four Monster Cards out there as it has a high 2400 ATK points with a very small cost.
You may say having your opponent drawing one card is a huge cost, but I would rather them do that than have Insect changed to DEF mode at the end of the turn.
The 'cost' would work well in a Mill Deck whereby your opponent mills cards. You have 2400 ATK points, plus the ability to milkl your opponent's deck!!
As it is a Level Four Monster Card, it has a good ATK which enables it to be kept on the field for an XYZ Summon of Number 39: Utopia.