The Emboldened Bloon is a Large Blooncard in Bloons Card Storm. Its Gold cost is reduced by 1 per Bloon currently in the player's queue. It can reach a minimum cost of 0 if all slots are filled, but that prevents the Bloon from being played, so its actual minimum cost is 1 Gold in practice.
Emboldened Bloon, just like Bolstered Bloon, needs swarms of bloons to take full advantage of themselves, the main differences with Emboldened Bloon are that it becomes cheaper as the Emboldened Bloon is sent deeper in the queue, and its health doesn't scale with extra bloons.
However, Red Bloon Storm stops the Emboldened Bloon from being placed. While still possible with two Arrow Shots from Quincy to pop a friendly Red Bloon, this is impractical.