Humbling Bundle

Humbling Bundle is a passive item.

Effects

 * Transforms all Heart, Bomb, Penny, and Key pickups into their respective Double versions.
 * Provides a 50% chance to transform Heart, Bomb, Penny, and Key pickups into their respective Double versions.
 * Does not work with Soul Hearts, Black Hearts, Half Red Hearts, Nickels, Dimes, or drops from.
 * Does not work with Gold Hearts, Lucky Pennies, Sticky Nickels, or Sacks.
 * Does not work with Charged Keys, Scared Hearts, Blended Hearts, or Bone Hearts.
 * Does not work with Rotten Hearts, Golden Pennies, or Giga Bombs (via Safety Scissors).

Synergies

 * : Single pickup drops have a 2/3 chance to spawn 2 of them, which are then doubled by Humbling Bundle. This essentially results in an average increase from 1.33x more pickups to 2.67x more.
 * The average gain is reduced to 2x more pickups instead.
 * : Anytime a shot spawns a Penny, two will appear.
 * This only occurs 50% of the time.
 * Allows for replicating hearts. Using the jar with 4 hearts inside it will cause 8 to drop, allowing you to create an infinite amount of Red Hearts.
 * : Allows all normal heart pickups to be worth four hearts. However it's bug sometimes.

Trivia

 * The item is a reference to the Humble Bundle, collections of games and soundtracks that are sold online through a "pay what you want" system. The original The Binding of Isaac was represented in three humble bundles.
 * This item displays as "Humbleing Bundle" when picked up. "Humbleing" is a common misspelling of the word "humbling", though it is unknown if this is an intentional typo or a mistake.