Lucky Block

The Lucky Block is a tool where you can get something good or either die from an anvil falling upon your head.

Appearence
The tool looks like a yellow block that has question marks on the sides of it, that is 3 studs big in all directions.

Cage & Anvil
A cage will appear on your character, an anvil will also spawn causing you to get crushed (most of the time) by said anvil.