Loot Randomizer addon will change drops from mobs, items and blocks. For example you destroy dirt block, it summons spider. Another example, you can kill creeper and get gold block. All drops will be randomize automatically. This addon is a little bit similar to addon "Lucky block". You always do not know what blocks can drop. Do you feel the your Minecraft is getting bored? Try to this addon and have fun!
Note that you can open addon setting and change loot. You will have 23 loot tables to choose. How to open addon settings? open gear icon