Modeling Clay is an unlockable trinket in The Binding of Isaac, added in the Repentance DLC.

Entering a new room has a 50% chance to grant a random passive item from the current room's item pool, that lasts for the rest of the room.

Can only mimic the effects of items with the summonable tag.

The trinket takes the form of the given item in the HUD.

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

Defeat Mother as Tainted Eden.

The following special synergies and interactions for Modeling Clay have been documented.

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

Below is the Internal Item Description as shown in-game.
Note that some stat changes are not displayed here. Please see the main description for the full effects.

Modeling Clay

• 50% chance of mimicking a passive item for the room
• Golden Trinket (without Mom's Box): 100% chance of mimicking a passive item for the room
• Mom's Box: 100% chance of mimicking a passive item for the room
• Mom's Box + Golden Trinket: 100% chance of mimicking a passive item for the room

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