Zany Juice is an Exotic Powercard in Bloons Card Storm, introduced in version 5.0. When played, it adds 35 health to all charges of one random Bloon card in the player's hand. The affected Bloon card glows briefly, which is visible to both players, and creates a "buff" sound effect, which is audible to both players. This card is playable if the player has no Bloons in their hand, but doing so has no effect. It can only be added to Zee Jay decks.
Zany Juice can be combined with a low hand of Bloons to help Aggro. It's best used with a low amount of Bloons in hand to buff what you want.
Good candidates include Double Attack Bloons (especially Double Red Bloons for how cheap they can be afforded) and Triple Threat Bloons for their synergy with health buffs, as well as cards with lots of charges, like Swarm Yellow Bloons.
Zany Juice hitting a Bloon like Steady Growth Bloon can be used to help it survive and grow more reliably.
Zany Juice can be used with Bloons like Triple Threat Bloon for OTK potential, allowing it to gain health while in your hand, reducing the cost of the combo when played.
Two of them plus his passive and two Quick Ready is enough to OTK an opponent that lacks shields, has insufficient Defenders and/or Adora's Sun Shield, and no 0-delay stoppers.
Ninja Kiwi proposed a nerf to Zany Juice on Version 5.2 by decreasing its Health bonus from +50 to +40 Health. Community feedback proposed a further nerf to +35, which was approved in the update.