Rock Bottom: Permanently increases Isaac's stats when it transforms into an item that surpasses Isaac's current stats.
Interactions[ | ]
Chaos: Removes the room pool constraint for Modeling Clay's available items.
Sacrificial Altar: If Modeling Clay is currently mimicking a viable familiar, it will also be sacrificed and spawn an additional Devil Room item, but Modeling Clay will not be destroyed.
TMTRAINER: Modeling Clay cannot copy glitched items; it will do nothing and not have a sprite if it tries to.
Sacred Orb: Temporary items are affected by Sacred Orb.
If Modeling Clay mimics the following items, they will behave in the following ways:
9 Volt: 1-room charge active items will not recharge over time. Other active items are affected normally.
Belly Button / Mom's Purse: Allows Isaac to hold another trinket alongside Modeling Clay if he picks it up while Modeling Clay mimics the item, and he will continue to hold both even after Modeling Clay changes. If Isaac tries to pick up another trinket while he already has two, it will instead be destroyed and he will only be able to hold one trinket again.
Isaac can safely exchange cards/pills/trinkets by manually dropping them, at the cost of being unable to hold two.
Extra trinkets held this way are susceptible to not working properly, if at all.
Candy Heart / Soul Locket: Stats granted from picking up hearts will persist after Modeling Clay changes.
Cambion Conception / Immaculate Conception: If Isaac can somehow meet the requirements for these items to spawn familiars, the familiars will persist for only one room after Modeling Clay changes.
Delirious / Mr. ME!: Has no effect, even if Isaac uses his active item.
Little Baggy / Polydactyly / Starter Deck: Allows Isaac to hold two cards and/or pills if he picks them up while Modeling Clay mimics the item, and he will continue to hold both even after Modeling Clay changes. If Isaac tries to pick up another card/pill after Modeling Clay changes, the inactive card/pill he was holding will be destroyed and he will only be able to hold one card/pill again.
If Isaac goes to a new room while Modeling Clay mimics Starter Deck/Little Baggy, cards/pills in the new room will be converted appropriately.
Schoolbag: If Isaac picks up another active item while Modeling Clay mimics the item, the other active item is dropped after Modeling Clay changes.
Strategy[ | ]
Modeling Clay can open additional advantages if a particularly helpful item is chosen for a given room. Exploring all rooms to see what effects are available may be worthwhile to gain the most value of the trinket:
Explosive shots: Allows Isaac to destroy rocks and open Secret Room doors without spending resources.
Hallowed Ground can be used first to spawn a white poop next to a Machine/Beggar that takes health to give Isaac the chance to resist damage taken from using them.
The Battery: Allows Isaac's active item to be overcharged; overcharging will persist after Modeling Clay changes.
Cancer / The Wafer: Reduces the damage taken from Sacrifice Rooms to half a heart, allowing Isaac to use them more.
Echo Chamber: Cards and runes’ effects will be stacked if used while it mimics the item. The game will remember what cards and runes were used if it turns into Echo Chamber in the future, even on later floors.
Lucky Foot / PHD / Virgo: Bad pills will be their good counterparts while mimicking these items, making them much safer to use.
Marbles: Allows trinkets to be smelted if Isaac can deal damage to himself while it mimics the item.
Pyromaniac: Lets Isaac heal off explosions in the current room. Can be used to greater effect in rooms with TNT or Bomb Bums.
The trinket's icon appears to be a clay model of Meat Boy from Super Meat Boy, another game by Edmund McMillen.
The item is a direct reference to the item of the same name in The Binding of Isaac: Four Souls, which turns into another available item when used.
In addition, the item is possibly a reference to the Self-forming Clay item from the rogue-like deckbuilder Slay the Spire
Bugs[ | ]
Bug!
Walking between rooms back and forward with Modeling Clay may cause the game to crash at random.
Bug!
Normally, Modeling Clay's appearance changes to reflect what item it's imitating. This is not the case if the trinket is absorbed, e.g. through Smelter. It will appear in the Found HUD where passive items appear, like other absorbed trinkets, but will never change its appearance.