Nested Yellow is a Basic Blooncard in Bloons Card Storm. It spawns a Nested Green if it is destroyed, which does not inherit any modified properties of its parent (e.g. its Delay or being On Fire).
Nested Yellows have 10 less health than normal Yellow Bloons but have only 1 charge, have 2 delay, and cost 1 more Gold. However, it has below average overall HP per gold for its 11 total turns to leak. If the opponent pops it early, this will reduce its total delay.
At 290 overall HP, this is over twice as much as a normal yellow, and 60 less than a Damaged Moab.
Nested Yellows are an extremely low threat, even if it provides continuous pressure to the opponent with its 4 total Bloons.
Nested Yellow can be easily defended with just 60 damage per turn monkeys, like 3 charges of Barrel Of Monkeys or high burst monkeys like Tack Sprayer.
For strategies that want multiple Bloons to spawn, using Zombie Bloons is generally more recommended due to their higher threat and lower delay.