Get any brick you want ( but not ones that might light on fire ) and get a bucket of lava redstone lever arrows dispenser and a fence gate. Then make a 3x3 wall out of the bricks with a hole in the middle. Next place bricks on the ground in front of the hole in the middle on the front and back. Next place the dispencer on a brick at the back and make it look out the front. Then place fence gate on the front brick then break that brick. Then fill in the hole with lava and fill the dispenser with the arrows. Next make your circuit with the redstone and lever. Then open the gate and pull the lever.