Since the spawner always spawns mobs around it, you can replace the blocks with netherrack and light them on fire, or place grass blocks with wither roses on top to kill mobs as soon as they spawn.

Life is hard enough, so why don't you convenience yourself with this portable charger and these handy blind-spot mirrors. View Entire Post › ...

The resources that are required for the exterior of this build include polished andesite, polished diorite, glass, iron trapdoors, grass blocks, sweet berries, composter, and oak fences ...