mob spawner trap.

First the materials you will need is 1 diamond pickaxe (or lots of other pickaxe's) and  will want to dig a 2 by 2 going down so you don't fall down in lava and once you hit bedrock make a mine searching for one.Then dig like crazy, you will find lots of diamond so i recommend you to have a iron pickaxe so you can make a diamond pickaxe. Once you have found the mob spawner (pig in the cage spinning) you can set a trap for them for example,get glass and make a wall where there trapped an d fill it up with water so when they spawn they will drown.