Humbling Bundle

Humbling Bundle is a passive item.

Effects

 * Transforms all Heart, Bomb, Penny, and Key pickups into their respective 1+1 versions.
 * Does not work with Soul Hearts, Black Hearts, half Red Hearts, Nickels, Dimes, or drops from The Book of Sin.
 * Does not work with Gold Hearts, Lucky Pennies, or Sticky Nickels.

Synergies

 * By bombing Donation Machines, the player can earn more money than is taken from the machine, giving an endless supply of coins until the machine breaks.
 * This is especially effective with Bomber Boy, as a single bomb can yield upwards of 20 coins.
 * Maggy's Bow allows all normal heart pickups to be worth four hearts.
 * With Contract From Below, drops will effectively be quadrupled.
 * Doubles the effectiveness of Lucky Rock and, when combined with the increase in bombs, the player can acquire huge numbers of pennies.
 * When used while fighting Greed, Hangers, or Keepers, every coin knocked out of Isaac will be worth two coins, allowing Isaac to net a profit.
 * The Jar: 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.
 * With Mom's Locket, half Red Hearts are turned into 1+1 Hearts too.
 * Head Of The Keeper: Anytime a shot spawns a coin, two will appear.

Trivia

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