'M is an unlockable trinket in The Binding of Isaac, added in the Repentance DLC.

Rerolls Isaac's active item every time it's used.

The rerolled active item will start with no charges.

Transformations will not be given from active items acquired via this trinket, even if the item was dropped and picked back up again.

Active items that have costs associated with using them (e.g. coins for Magic Fingers), will still be rerolled even if they cannot be used.

The active item's charge must be fully expended in order for it to reroll.

One-time-use items will disappear before being rerolled.

This page shows information as of the latest Repentance release.
To see latest up-to date information about this trinket for the new Repentance+ (Online Co-op) DLC, check this page instead.

Defeat Mother as Eden.

The following special synergies and interactions for 'M have been documented.

* Note that not all possible synergies and interactions are listed here.

• Check out the trinket description on the external Isaac Wiki.