Overload is a Basic Powercard in Bloons Card Storm, introduced in version 3.0. It destroys a target Bloon with 100 or less health on either player's side.
In decks that run a lot of Bloontonium generation, this is a cheap removal option for weak Bloons with special gimmicks, such as Toxic Bloons, Buddy Bloons, Steady Growth Bloons, Blooming Bloons, and weaker Double Attack Bloons. It can also finish off stronger Bloons after chipping them with other damage sources like Long Range Rang.
Overload costs the same as Quincy's Arrow Shot but does more than 3x damage to a weakened Bloon. Overload is only useful to add in a deck versus mirror aggro to finish off a powerful Bloon, such as partially damaged Double Yellow Bloons.
Quincy synergizes very well with Overload in decks for anti-Aggro purposes. Arrow Shot can get Bloons down to 100 or below health, and an Overload can use that damage to pop a Bloon without having to spend too much Gold or Bloontonium. Perceptive Shot can also put specific Bloons at 100 health or less, such as Double Yellow Bloons or Green Bloons boosted by Zee Jay’s Passive Awesomeness.
Overload is also a good option against bloons with armored, especially Lead Coating Bloon.
On Dark Castle, a Bloon that would have 100 HP elsewhere will need some damage first before Overload can target it.