M.A.T.H.

Behold, the Mental Annihilator of The Head confuses your monkeys (and buildings)! The M.A.T.H. awaits at round 100, who cannot wait to spin the heads of you and your monkey defenses. The blimp can attack and defend in interesting ways. The blimp has 6301 (prime number) HP.

Abilities
Add - Adds health to itself for 5 seconds. The lower the health, the stronger the regeneration. The red plus sign flashes before the ability.

Subtract - Subtracts 3HP from every tower on the map. The green minus sign flashes before the ability.

Multiply - Creates clones of itself, clones do 0.8x the damage the original blimp does. Every ability can be done for this mode, except for Multiply and Divide. The ability lasts for 15 seconds. The blue X flashes before the ability.

Divide - Divides itself into two pieces, each piece has half of the health of the original blimp. All abilities can be performed here, except multiply and divide. Subtract ability is 2HP for each, and Power Rocket can only split 3 times, each original only damaging 8HP. The purple divide symbol flashes before the ability.

Power Rocket - Fires a rocket from itself that splits 4 times before impacting a random area of the screen. If the original rocket hits a tower, it deals 15HP damage. If a rocket has split 1 time, it deals 8HP damage. If a rocket splits 2 times, one of those can deal 4HP damage. Split 3 times, 2, split 4 times, 1.5. The rockets fly in a tree formation when splitting.

Root Rockets - 75% chance of firing 4 rockets that do 2HP damage each, 20% chance of firing 9 rockets that do 3HP damage each, and 5% chance of firing 25 rockets that do 5HP damage each. The root symbol flashes before the ability.

Trivia

 * The idea came to me as I was in a car.