The Booster Bloon is a Basic Blooncard in Bloons Card Storm, introduced in version 3.0. It allows the player to select another Bloon on their side (but not itself) to increase its Delay by 1 and Health by 100. If it is the only Bloon on the player's side, the On Play effect does not trigger, as it cannot target itself (despite what its description implies).
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Booster Bloon is sort of the Bloon variant of Improved Fortification. Compared to Improved Fortification, it has two charges, costs 2 Gold instead of 3, and generates Bloontonium, but it only adds 100 Health instead of 150 (though it has 50 Health of its own) and cannot be used on a full Bloon track.
Like Improved Fortification, it works best on Double Bloons. However, to avoid the opponent's Return to Sender gaining full value, avoid boosting the same bloon twice.
The bloon itself is not much of a threat, but should not be ignored against aggro players, especially Zee Jay. The extra +100 HP is equivalent to a stronger Green Bloon placed into another bloon, plus another potential 50 HP from that Booster Bloon. It's still quite slow, however.
Health reduced ― 70 → 50
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Booster Bloon target menu
Booster Bloon boosting a Zee Jay Special
Attempting to tap own Booster Bloon on play will be denied
