Blank Card

Blank Card is an unlockable activated item.

Effects

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

Synergies

 * - Essentially uses the card or rune twice (similar to ). 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.
 * Car Battery + - The card is used 4 times at once.
 * / /  - Allows Isaac to choose between 2 different effects to copy.
 * - The card is used two times at once.
 * Allows to create a variety of useful effects by copying cards and runes:
 * / /  /  /  /  - Grants reusable teleportation to specified rooms.
 * - Grants a reusable homing tears effect.
 * Provides a reliable method to unlock.
 * / /  /  - Grants Isaac a reusable source of increased stats.
 * Multiple uses of III - The Empress in the same room will stack the damage increase.
 * / - Provides a reusable source of soul hearts.
 * / /  - Provides a reusable source of red hearts.
 * VI - The Lovers / 2 of Hearts + - Allows Isaac to use Blood Donation Machines very easily, using the Blank Card to get hearts back very quickly due to Habit's charge.
 * - Provides a reusable source of all pickups.
 * - Grants Isaac a reusable full health effect, effect, and a full map reveal. Can also be combined with  or  for both infinite health and infinite The Necronomicon effect.
 * - Grants Isaac a reusable map reveal, except for the super secret room.
 * / - Provide a reusable source of coins.
 * 2 of Diamonds + 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.
 * / - Provides a reusable resource of keys.
 * / - Provides a reusable resource of bombs.
 * - 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 The 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.
 * - Allows rooms to be repeatedly filled with Poop.
 * A Card Against Humanity + - Destroying all the poop will spawn a large number of blue flies.
 * A Card Against Humanity + - The poop has a high chance to spawn pickups.
 * - Grants Isaac a reusable source of three random cards.
 * - Allows the player to instantly kill any monster every usage, including late-game bosses.
 * - Allows the player to take shop, devil room and black market items for free across multiple floors.
 * - Grants Isaac a reusable effect.
 * / - Grants Isaac reusable protection. Especially useful for The Lost due to his lacking of health.
 * - Allows Isaac to consume his extra lives instantly for extra pickups.
 * - Grants Isaac a reusable source of three blue flies and three blue spiders.
 * - Allows Isaac to copy pickups with every use. This combination can double little batteries, which can allow for gamebreaking combos, due to repeated use of the synergy.
 * / - Provides a reusable resource of rerolling.
 * Dice Shard + +  - 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.
 * - Provides a reusable random rune effect, with a 25% chance to spawn another Blank Rune.
 * - Allows Isaac to consume unwanted pickups and items frequently, gaining a lot of free stat upgrades and blue spiders/flies.

Interactions

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

Seeds
K9B6 DYHA (Treasure room adjacent to spawn) 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)