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The Blank Card is an activated item introduced in The Binding of Isaac Rebirth. It is a card with a white, blank face.

Effects

On use, it replicates the effect of the card or rune you currently have. Despite them occupying the same slot, the Blank Card will not mimic Pills.

Synergies

Jera: The Blank Card allows repeateed use of the Jera rune. Using this synergy with a room containing at least 2 batteries will result in a net increase in the number of batteries, which can be repeated to effectively give infinite Blank Card charges on a floor.