Butter!

Butter! is an unlockable trinket added in The Binding of Isaac: Afterbirth †.

Effects

 * Using an active item will drop it onto a pedestal on the ground.
 * When Isaac takes damage, there is a 2% chance one of Isaac's passive items will drop on the ground.

Synergies

 * / / : Because the active item is dropped upon usage, the recharge time for them is reset to 4, allowing to use more expensive cards/runes much more frequently.
 * : Items that are normally unusable when holding Butter! can still activate their effects if absorbed by Void.

Interactions

 * Consumable actives: Active items that remove themselves upon use do not drop and are consumed as normal.
 * Controllable actives: Active items that require additional input to control after being used (like or ) create no effect and are dropped on the ground. They retain charge when picked up.
 * Familiar spawning actives: Active items that spawn Blue Flies, Blue Spiders, or items like will spawn those familiars before dropping.
 * This applies to active items that spawn pickups.
 * Tainted characters with active items in their consumable slots can drop them from getting hit, however they will only be able to pick it back up into the active item slot.
 * : The flight granted by the Bible persists even though the item is dropped.
 * : Is removed from Isaac and dropped, but is given back to Isaac discharged upon going back in time into the previous room. The room in which Glowing Hour Glass was used will not contain another Glowing Hour Glass.
 * : Isaac animates a jump but his movement remains normal and he cannot go over any obstacles.
 * : Effect from the Metronome is immediately canceled beyond the gain of hearts, coins, bombs, or keys. Visual effects may persist until leaving the room.
 * : The flight granted by The Pinking Shears persists, but the body familiar is immediately canceled.
 * : Deals damage to Isaac as normal but does not increase damage for the current room.
 * Using active item will drop it and spawns an extra item pedestal on the ground; Getting hit may cause Isaac to drop an activated Damocles, one of the only ways to remove the item without the sword falling.

No Effect
Butter! will immediately cancel the effects of and discharge these active items when dropped, unless they are consumed with. 

Trivia

 * Butter! has been added in Booster Pack, after the initial release of the DLC.
 * Butter! was made by Florian Himsl (developer and programmer of the original The Binding of Isaac game).