Blank Card

Blank Card is an unlockable activated item.

Effects

Copies the effect of the card or rune currently held by Isaac.
Copies the effect of the card currently held by Isaac. Blank Card's recharge time changes upon use, depending on the card Isaac was holding when he used it.

Notes

Blank card also mimics Dice Shard and Emergency Contact.
Using Blank Card does not expend the consumable.
Using the Blank Card with a consumable that isn't compatible, or no consumable at all, spends the charge with no effect.
If holding more than one consumable (e.g. Starter Deck, Tainted Characters...), only the consumable that is selected will be used. If one of them isn't a card, they must ensure the card is the one selected when activating Blank Card, otherwise the effect won't be triggered.

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:

3 rooms:

4 rooms:

Single use:

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

Synergies

Butter!: As Blank Card is dropped upon usage, the recharge time for it is reset to 4, allowing to use more expensive cards much more frequently.
Book of Virtues: Spawns card wisps in the middle ring. The wisps spawn random Cards when destroyed, and enemies killed by the wisps' tears have a 15% chance to drop a Card. A wisp is given even if Isaac is not holding a card when the item is used.
Car Battery: Uses the card twice. For example, if used with the Two of Hearts/Diamonds/etc. cards it will quadruple whatever amount Isaac has.
Tarot Cloth: Invokes the extra effect when used.
- Only certain cards gain the Tarot Cloth effect with Blank Card.
- Car Battery + Tarot Cloth: The effect of the active card is quadrupled.
  - Only certain Tarot Cloth effects will be doubled again.
2 of Diamonds + Restock or in Greed mode:
- Coins can be infinitely generated by buying Lil' Batteries. As Lil' Batteries only cost 5 coins (need two lil' batteries to reload blank), as long as Isaac starts with at least 21, the maximum of 99 coins can be quickly reached.
- This cannot be repeated infinitely outside of Greed Mode, as Restock now increases the price of a shop slot each time something is purchased from it. Having 12 coins will very slowly allow Isaac to obtain 99 coins, however.
  - Deep Pockets allows this to once again be repeated infinitely, as the price will cap at 99 coins, while up to 999 coins can be obtained.
? Card: Teleports Isaac to the I AM ERROR room. This will consume both the Blank Card and the ? Card.
- An exception is when they are used on Chest, Dark Room, Ultra Greed, Mausoleum/Gehenna II leading to Ascent, or Home floors. Using them here consumes both the Blank Card and the ? Card, spawning an I AM ERROR Shopkeeper.
Rune of Jera: Copies 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

Little Baggy: All cards are replaced by pills, rendering Blank Card useless unless Isaac also has Starter Deck.
Wild Card: Does nothing if used through Blank Card. Wild Card can, however, copy the last card used through Blank Card.

In-game Footage

Unlockable Achievements

Blinding Baby - Use Blank Card while holding XIX - The Sun.

Trivia

This item is a card counterpart to Placebo and Clear Rune.
? Card sending Isaac to the I AM ERROR room and destroying both items is a nod to how the combination acting as expected would create an infinite loop, as the two items would attempt to use each other infinitely.