Effects after damage in The Binding of Isaac Repentance+
Items and trinkets that activate upon having Isaac take damage (or have an effect that activates upon taking damage, such as losing the effect) even if just randomly or under specific conditions. Items that activate only by being low on health don't count unless they specifically require taking damage (Effect per room).
Items that need you to absorb/hold other items don't count (Ex. Void).
Active items that charge by getting hit on their own or damage Isaac TO activate are counted.
Converting hearts is not the same as taking damage. Similarly, getting hurt by the effect is not the same as taking damage to activate.