My mistake, had another bug in here but removed and out in a different thread.. Forgot to update title
I was. I added a lamp after the comparator to make sure it wasn't working
Three command blocks in an arrow formation facing right or left (http://gyazo.com/d7b86faf2b1e7eed837bc2a0270504bb)
Top block: setblock ~ ~-1 ~ minecraft:air
Right block: /execute @p ~ ~-1 ~ fill ~ ~ ~ ~ ~ ~ slime 0 replace emerald_block
Bottom block: setblock ~ ~1 ~ minecraft:redstone_block 0 destroy
Comparator from right block, redstone block between top and bottom (creates a fast clock)
World the bug is acting on attached. Required to summon an EnderCrystal on ground level (stone) and then walk through it. This will begin the chain reaction. Watch the redstone blocks that are placed beside the dispenser in the ground. they are not updating