Minecraft Mod – Lucky Block Mod – Gambling w/ Blocks
The Lucky Block mod adds just one block, yet over one hundred possibilities to Minecraft! Just mine the Lucky Block, cross your fingers, and hope it will drop the items you need. But now, with this new version, you can expect more than just items; The Lucky block can spawn animals, monsters, other entities and even structures!
You can see or download : http://www.5minecraft.net/Lucky-Block-mod/