Minecraft wiki entry for Blaze_farming, associated text: This design was one of the few fully automatic designs for a blaze farm. Because of the fact that it is fully automatic, it requires a lot more redstone than semi-automatic farms, and is therefore more complicated. What happens in this blaze farm is, a player must be in a certain spot, so that the blazes can attack that player. Once the player is attacked, tamed wolves positioned in a certain spot will kill the blaze. Due to the update in 1.8, this design no longer works as blaze do not swim upward in lava.