The maximum possible number of lives

the-binding-of-isaac-rebirth

In a video of Binding of Isaac: Rebirth, a player managed to get "x12?" next to his health.

enter image description here

I know this stands for amount of times you can die without getting a game over.

What is the maximum number of lives that you could theoretically get by playing the game as is?

Best Answer

These are the items that grants extra lives (only those with a graphical feedback on the lives counter):

The total will make 13?.

There's a way to increase that total, using Diplopia enter image description here (Afterbirth exclusive) on Dead Cat. In this way you can get another Dead Cat, therefore obtaining 18 extra lives. (Assuming you can use Diplopia only once in a run.)

Adding the remaining items will make an amazing total of 22? lives!

EDIT:

As EnragedTanker suggested, if you manage to have every extra-life item in one room (using some kind of game-breaking exploit like Blank Card + Jera) and then use Diplopia on them you will double each item.
In this case the total will be 26? lives.