Blank Card

Effects

Copies the effect of Isaac's held card (Removed in Repentance) or rune.
- (Added in Afterbirth / Removed in Repentance) Also mimics (Dice Shard) Dice Shard and (Emergency Contact) Emergency Contact.

Notes

Using the Blank Card does not expend the consumable.
Pills can be mimicked only by (Added in Afterbirth) Placebo.
(Added in Repentance) Runes and soul stones can be mimicked only by Clear Rune.
Using the Blank Card with a consumable that is not compatible, or no consumable at all, will spend the charge with no effect.

(Added in Repentance) Recharge Time

Blank Card's recharge time changes upon use, depending on the card Isaac was holding when he used it (except in the case of using the item with no held card). This is a list of the following recharge times the card can have:

1 room:

2 rooms:

3 rooms:

4 rooms:

6 rooms:

12 rooms:

Single use:

(? Card) ? Card
- ? Card has a unique interaction with Blank Card, noted in the synergies section.

Synergies

(Added in Repentance)(Butter!) Butter!: Because Blank Card is dropped upon usage, the recharge time for it is reset to 4, allowing to use more expensive cards much more frequently.
(Added in Repentance) Book of Virtues: Spawns wisps in the center ring, looking like cards. The wisps spawn Cards when destroyed, and enemies killed by the wisps' tears have a 15% chance to drop a Card. The effect of the wisps and the types of cards they spawn are independent from Blank Card's charge time and the most recently used card.
(Added in Afterbirth) Car Battery/(Added in Afterbirth † / Removed in Repentance) Tarot Cloth: Essentially uses the card twice. If used with the Two of Hearts/Diamonds/etc. cards it will quadruple whatever amount Isaac has.
- Car Battery + Tarot Cloth: The card is used 4 times at once.
(Added in Afterbirth / Removed in Repentance) (2 of Diamonds) 2 of Diamonds + Restock or in Greed mode: Coins can be infinitely generated by buying Lil' Batteries. As Lil' Batteries only cost 5 coins, as long as Isaac starts with at least 11, the maximum of 99 coins can be quickly reached.
- (Added in Repentance) This cannot be repeated infinitely, as Restock now increases the price of a shop slot every time something is purchased from it. Having 12 coins will very slowly allow Isaac to obtain 99 coins, however.
  - This does not apply in greed mode.
  - Having Deep Pockets allows this to once again be repeated infinitely, as the price will cap at 999 coins.
(Added in Afterbirth)(? Card) ? Card: Teleports Isaac to the (I AM ERROR) I AM ERROR room. This will consume both the Blank Card and the ? Card.
- An exception is when they are used on (Chest) Chest, (Dark Room) Dark Room, or Ultra Greed floors. Using them here consumes both the Blank Card and the ? Card and spawns an I AM ERROR Shopkeeper.
  - (Added in Repentance) Likewise occurs on (Home) Home floors.
(Removed in Repentance) (Rune of Jera) Rune of Jera: Allows Isaac to copy pickups with every use. This combination can double Lil' Batteries, which can allow for game-breaking combos, due to repeated use of the synergy.
- Spawning too many items will cause objects to despawn. This can even despawn the End Chest after finishing a final boss fight.

Interactions