I ran into this rainbow poop.

Breaking it caused a nice sound effect and a rainbow to pop up on the screen. Did it do something else too, or is that all it does? Was I unlucky and got something I already had, like full health?

3 Answers

This is all we know so far:

• Causes a rainbow to appear on the screen
• Can also drop coins, keys bombs or hearts.
• Gives full health upon destruction.

from bindingofisaacrebirth.gamepedia.com

1

Yeah, it restores full health.

I had a familliar, the BFF, the friendly fly, and it had died, then I broke the poop, it revived him.