Equality!

Effects

All pickups on the ground become their doubled variants as long as Isaac's held pickups are all the same number, e.g. 65 pennies, 65 bombs, 65 keys.

(Removed in Repentance) All single keys, bombs and red hearts in a shop will become free when doubled.
- This is likely due to the entity being removed and a double variant being spawned, instead of simply overriding it before it spawns like (Humbling Bundle) Humbling Bundle does.
(Removed in Repentance) Upon picking up a non-doubled pickup that makes Isaac's pickups equal in number, a doubled variant will be spawned as well.
Doubled pickups will not revert if Isaac's pickups become unequal.
This trinket works well in Greed mode, doubling all pennies spawned from completing waves as long as Isaac's pickups are equal.

(Added in Repentance)(Hypercoagulation) Hypercoagulation: As long as Equality is active, all hearts spawned will be doubled and never disappear. Hearts remain on the ground even after the effect is no longer active.
(Added in Repentance)(Options?) Options?: While Equality! is active, both rewards can be collected without the other despawning. Options? also makes Equality! easier to keep active.
(Tainted ???) Tainted ???: T.???'s poop pickups are not required for Equality to work, making it much easier to use.
(Tainted Keeper) Tainted Keeper: Doubled pennies from killed enemies will not despawn. All other coin types will still disappear.