? Card

? Card is a Special Card added in the Binding of Isaac: Afterbirth expansion.

Effect

 * Replicates the effect of Isaac's activated item.

Interactions

 * Diplopia - Expends both the card and the item with no additional benefit.
 * Pandora's Box - Expends both the card and the item with no additional benefit.
 * Forget Me Now - Expends both the card and the item with no additional benefit.
 * Jar Of Flies - Expends both the card and all charges with no additional benefit.
 * Mama Mega! - Expends both the card and the item with no additional benefit.

Synergies

 * Blank Card - Teleports the player to the I AM ERROR room of the current floor. This will consume both the Blank Card and the ? Card.
 * Glowing Hour Glass - Since the card replicates the effect of moving back one room to the previous state, you keep the card having not used it as an item until the room later. This effectively gives you unlimited, charge-free uses of the Glowing Hour Glass.

Trivia

 * The interaction with Blank Card presents a paradox, as Blank Card and ? Card try to replicate the effects of each other. This would result in an endless loop, so a special case was put in.
 * The Blank Card interaction is one of the three reliable ways to reach the I AM ERROR room in game, alongside Teleport 2.0 in certain circumstances and Undefined.

? Card