Blank Card

Blank Card is an unlockable activated item.

Effect

 * Mimics the effect of Isaac's held card or rune.
 * Does not consume Isaac's current held item.
 * Will not mimic pills.

Synergies

 * Starter Deck/Deep Pockets - Allows Isaac to choose between 2 different effects to copy.
 * Car Battery - Essentially uses the card or rune twice. If used with the Two of Hearts/Diamonds/etc. cards it will quadruple however much you have, and if used with a Jera Rune it will quadruple the number of pickups in the room.
 * Allows to create a variety of useful effects by copying cards and runes:
 * III - The Empress - Damage bonus for second and all subsequent activations is higher than the initial and slowly increasing.
 * VI - The Lovers / V - The Hierophant - Spawns a great amount of hearts.
 * VIII - Justice - A stronger version of The Book of Sin
 * XIX - The Sun - Allows a repeatable 4 charge full healing, a The Necronomicon effect and a full map reveal. Can also be combined with Sharp Plug or Habit for both infinite health and infinite The Necronomicon effect.
 * Chaos Card - Allows the player to instantly kill any monster every 4 rooms, including late-game bosses.
 * Credit Card - Allows the player to take Shop, Devil Room and Black Market items for free across multiple floors.
 * Dice Shard - Works as a 4-room recharge The D6 + D20.
 * Dice Shard + Sack Head + Glitter Bombs - Glitter Bombs make pickups, Sack Head turns pickups into sacks, sacks have a chance of containing batteries but contain more pickups, and unused pickups can be re-rolled into more sacks.
 * Algiz - A much stronger version of the Book of Shadows.
 * Perthro - Works as a 4-room recharge The D6.
 * Ehwaz - Works as a 4-room recharge We Need to Go Deeper!
 * Jera - Allows the player to duplicate pickups which in combination with batteries can allow for gamebreaking combos.
 * ? Card - Teleports you 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 or Ultra Greed floors. Using them here consumes both the Blank Card and the ? Card and spawns an I AM ERROR Shopkeeper.
 * 2 of Diamonds - Doubles Isaac's coins every 4 rooms.
 * With Restock or in Greed Mode, coins can be infinitely generated by buying Little Batteries. As batteries only cost 5 cents, as long as Isaac starts with at least 11 cents, the maximum of 99 cents can be quickly reached.
 * Black Rune - Allows Isaac to consume unwanted pickups and items frequently, gaining a lot of free stat upgrades and blue spiders/flies.
 * A Card Against Humanity: Allows rooms to be repeatedly filled with Poop.
 * A Card Against Humanity + Lil Larva: Destroying all the poop will spawn a large number of blue flies.
 * A Card Against Humanity + Petrified Poop: The poop has a high chance to spawn Pickups.

Interactions

 * Little Baggy - Renders the Blank Card useless since all cards and runes are transformed into pills, unless the player also has Starter Deck.

Trivia
Using Blank Card while holding XIX - The Sun unlocks the Blinding Baby, a co-op baby that activates the effect of XIX - The Sun upon death.

Seeds
3C6Z 880R (Within shop) E8XS 8371 (Within shop) (Rune of Jera inside Curse Room!) (All in First Floor) GRCJ PCSP (Treasure room adjacent to the spawn) 9B2E 2XBZ (Treasure room adjacent to spawn)

Blank Card