Mysterious Paper is an unlockable trinket.
Effects
- Upon hit, has a small chance to activate the
A Missing Page effect. (Probably the same chance as the Missing Page itself) - Upon taking damage at one half red heart or less, there is a moderately common chance to trigger the effects of either The Polaroid or The Negative.
- Small chance to take the player to the Chest or the Dark Room without The Polaroid or The Negative.
- Small chance to display a puzzle piece on Isaac's Last Will in the same way as the Missing Poster.
- Small chance to revive Isaac as The Lost upon death in the same way as the Missing Poster.
Notes
- It seems that the Mysterious Paper randomly imitates the effect of a paper item when appropriate. Unlike the 3 Dollar Bill, the Mysterious Paper does not choose which effect it will have in the current room. Rather, it seems to randomly decide whether a particular effect will activate when relevant. It is theoretically possible that the Mysterious Paper can also sometimes provide the effects of BOGO Bombs, Error: The given collectible ("Humbling Bundle") does not exist., Contract From Below, Bible Tract, and Store Credit, though this has yet to be proven true.
In-game Footage
 Eden Unlocks
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 The Binding of Isaac: Rebirth
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